Scintilla v5.5.0

[ahmetsait]

Changes of interest:

• Implement solution-local NuGet registry
• Remove unused project files and put source files into project folder
• Move build/**.dll to NuGet's special runtimes folder
• Update Scintilla.dll & Lexilla.dll
• Fix transparent colors
• Fix incorrect default values
• Implement Scintilla element APIs

[ahmetsait]

Published as ahmetsait.Scintilla5.NET for easy testing.

[ahmetsait]

Rebased.
I know it's a lot to take at once but all changes are contained in their atomic commits for easy review so it would be phenomenal if this gets merged.

[desjarlais]

@ahmetsait Why use the scintilla native dll as the version number?

[ahmetsait]

Don't have a good reason other than it seemed close enough and a nice round number. Agreed that they are unrelated and we shouldn't be trying to sync them.

[ahmetsait]

Thanks a lot! Any chance of a NuGet release?

[desjarlais]

@ahmetsait I'm getting build errors with the nuget file with the cd command giving an exit code 1. One I fix that I'll work on a release.

[ahmetsait]

I might be able to fix that on my change history PR later on.

[desjarlais]

I got it fixed, ps was disabled so the ps1 was not able to run, it is good now the nuget is released