#617 [wxSmithSTC] Replace wxScintilla with wxStyledTextCtrl and fix multiple other errors

[bluehazzard]

Replace wxScintilla with wxStyledTextCtrl provided by wxWidgets since version 3.0.0
Fix wxRichTextCtrl code generator for wxWidgets > 3.0.0
Build only for wx3.0 because wxStyledTextCtrl is only provided after this version
Add wxSmithSTC to the workspace files so they get build by default

[bluehazzard]

Added a ziped version of the patches for easier download

[Teodor Petrov]

@bluehazzard: Would you be able to push this?