Upgraded Core version to 6.0 and 2 new params: Sources Encoding and Builtins Path

[Lorthiz]

Changelist:

• Upgraded Core version to 6.0. Just a small change, there are no breaking changes between versions,
• Added param to change Source and Output Encodings, Scripts may be by design in at least few encodings depending on a region: Win1250, Win1252 etc. So this params allows to change encoding of source/output files. By default both encodings are set to Win1250
• Builtin types are now bundled with executable, so builtin path is no longer needed, but added flag for disabling builtin types if someone would want to overwrite them.
• Extracted Help text to resource: help.txt
• CompilerOptions cleanup - there was a lot of moving of the same data around. Now both Compiler and Program just use the same object for managing options.