Added base on-the-fly compiler for Boo Scripts.
Implemented Boo Scripted Plugins:
 - Create plugins using boo (single files only at the moment which cannot access other boo files)
 - Scripted plugins are compiled on the first start for performance reason and generate compiled assemblies in the Package_cache folder
 - Multiple files scripted plugins is coming next.
Added possibility to use scripted plugins with multiple files.
AboutView now shows scripting plugins.
Prepared the base for future script compilers.
Display scripting errors in AboutView.
Merge branch 'feature/boo-scripting' into develop