Ran:
git checkout smithy-test-models -- resources.smithy

…igDecimal

We may have to address this later.

Oi... this depends on all the simple types...
Is that intentional?
Or is that a mistake when we authored this Smithy?

Our Dafny code generator does not support:
- Bytes
- Shorts
- Floats
- BigInteger
- BigDecimal
- Timestamp

Or smithy-polymorph will not output a Types.dfy.

Issue: transpile_test_net is failing:

```
$ make polymorph_dafny verify polymorph_net transpile_net
dafny \
	  -vcsCores:2 \
	  -compileTarget:cs \
	  -spillTargetCode:3 \
	  -compile:0 \
	  -optimizeErasableDatatypeWrapper:0 \
	  -useRuntimeLib \
	  -out runtimes/net/tests/TestsFromDafny \
	  -library /Volumes/workplace/ryan-new-world/polymorph/TestModels/resources/src/Index.dfy \
	  `find ./test -name '*.dfy'`
Unhandled exception. System.AggregateException: One or more errors occurred. (Object reference not set to an instance of an object.)
 ---> System.NullReferenceException: Object reference not set to an instance of an object.
   at Microsoft.Dafny.ErrorReporter.Error(MessageSource source, IToken tok, String msg) in /Volumes/workplace/dafny_src/dafny/Source/DafnyCore/Reporting.cs:line 45
   at Microsoft.Dafny.ErrorReporter.Error(MessageSource source, IToken tok, String msg, Object[] args) in /Volumes/workplace/dafny_src/dafny/Source/DafnyCore/Reporting.cs:line 67
   at Microsoft.Dafny.Resolver.ResolveMember(IToken tok, Type receiverType, String memberName, NonProxyType& tentativeReceiverType) in /Volumes/workplace/dafny_src/dafny/Source/DafnyCore/Resolver/Resolver.cs:line 12384
   at Microsoft.Dafny.Resolver.EnsureSupportsErrorHandling(IToken tok, Type tp, Boolean expectExtract, Boolean hasKeywordToken) in /Volumes/workplace/dafny_src/dafny/Source/DafnyCore/Resolver/Resolver.cs:line 11884
   at Microsoft.Dafny.Resolver.ResolveAssignOrReturnStmt(AssignOrReturnStmt s, ResolutionContext resolutionContext) in /Volumes/workplace/dafny_src/dafny/Source/DafnyCore/Resolver/Resolver.cs:line 11866
   at Microsoft.Dafny.Resolver.ResolveConcreteUpdateStmt(ConcreteUpdateStatement s, ResolutionContext resolutionContext) in /Volumes/workplace/dafny_src/dafny/Source/DafnyCore/Resolver/Resolver.cs:line 11476
   at Microsoft.Dafny.Resolver.ResolveStatement(Statement stmt, ResolutionContext resolutionContext) in /Volumes/workplace/dafny_src/dafny/Source/DafnyCore/Resolver/Resolver.cs:line 9581
   at Microsoft.Dafny.Resolver.ResolveStatementWithLabels(Statement stmt, ResolutionContext resolutionContext) in /Volumes/workplace/dafny_src/dafny/Source/DafnyCore/Resolver/Resolver.cs:line 12132
   at Microsoft.Dafny.Resolver.ResolveBlockStatement(BlockStmt blockStmt, ResolutionContext resolutionContext) in /Volumes/workplace/dafny_src/dafny/Source/DafnyCore/Resolver/Resolver.cs:line 12102
   at Microsoft.Dafny.Resolver.ResolveMethod(Method m) in /Volumes/workplace/dafny_src/dafny/Source/DafnyCore/Resolver/Resolver.cs:line 8809
   at Microsoft.Dafny.Resolver.ResolveClassMemberBodies(TopLevelDeclWithMembers cl) in /Volumes/workplace/dafny_src/dafny/Source/DafnyCore/Resolver/Resolver.cs:line 8001
   at Microsoft.Dafny.Resolver.ResolveTopLevelDecls_Core(List`1 declarations, Graph`1 datatypeDependencies, Graph`1 codatatypeDependencies, Boolean isAnExport) in /Volumes/workplace/dafny_src/dafny/Source/DafnyCore/Resolver/Resolver.cs:line 2854
   at Microsoft.Dafny.Resolver.ResolveModuleDefinition(ModuleDefinition m, ModuleSignature sig, Boolean isAnExport) in /Volumes/workplace/dafny_src/dafny/Source/DafnyCore/Resolver/Resolver.cs:line 1043
   at Microsoft.Dafny.Resolver.ResolveProgram(Program prog) in /Volumes/workplace/dafny_src/dafny/Source/DafnyCore/Resolver/Resolver.cs:line 510
   at Microsoft.Dafny.Main.Resolve(Program program, ErrorReporter reporter) in /Volumes/workplace/dafny_src/dafny/Source/DafnyCore/DafnyMain.cs:line 215
   at Microsoft.Dafny.Main.ParseCheck(IList`1 files, String programName, ErrorReporter reporter, Program& program) in /Volumes/workplace/dafny_src/dafny/Source/DafnyCore/DafnyMain.cs:line 166
   at Microsoft.Dafny.DafnyDriver.ProcessFilesAsync(IList`1 dafnyFiles, ReadOnlyCollection`1 otherFileNames, ErrorReporter reporter, Boolean lookForSnapshots, String programId) in /Volumes/workplace/dafny_src/dafny/Source/DafnyDriver/DafnyDriver.cs:line 345
   --- End of inner exception stack trace ---
   at System.Threading.Tasks.Task.ThrowIfExceptional(Boolean includeTaskCanceledExceptions)
   at System.Threading.Tasks.Task`1.GetResultCore(Boolean waitCompletionNotification)
   at System.Threading.Tasks.Task`1.get_Result()
   at Microsoft.Dafny.DafnyDriver.ThreadMain(String[] args) in /Volumes/workplace/dafny_src/dafny/Source/DafnyDriver/DafnyDriver.cs:line 123
   at Microsoft.Dafny.DafnyDriver.<>c__DisplayClass10_0.<Main>b__0() in /Volumes/workplace/dafny_src/dafny/Source/DafnyDriver/DafnyDriver.cs:line 100
   at System.Threading.Thread.StartCallback()
/Users/tonyknap/workplace/dafny_src/dafny_path/dafny: line 34: 15045 Abort trap: 6           "$DOTNET" "$DAFNY" "$@"
make: *** [transpile_test_net] Error 134
```

…t-resources

`test_net` now fails with:
```
/Volumes/workplace/ryan-new-world/polymorph/TestModels/resources/runtimes/net/Generated/Wrapped/TypeConversion.cs(190,13): error CS0246: The type or namespace name 'WrappedNativeWrapper_SimpleResource' could not be found (are you missing a using directive or an assembly reference?) [/Volumes/workplace/ryan-new-world/polymorph/TestModels/resources/runtimes/net/SimpleResources.csproj]
```

Which I suspect is smithy-dotnet issue.
It may be that smithy-dotnet assumes all resources
are extendable.

The C# Native Wrapper assumes an exception exsits
named SimpleResourcesException.
More generically,
it assumes an exception named <Namespace>Exception exsits.

Run:
`make polymorph_dafny polymorph_net verify transpile_net setup_net test_net`
to confirm.

Resolves PR #135 Feedback:
- #135 (comment)