Clean Error Handling

This draft adds clean, readable console errors for parse and runtime failures.

Runtime errors can be used to track the script line where the error occurred. They can also display the chain of Skript trigger calls and the trigger that started the program.
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Parse/compile errors will show the element that failed, and the match information.
Syntaxes may suggest help for close matches that failed.
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Full Changelog: 1.0.2...1.0.3