Added PublicResXFileCodeGenerator custom tool

The PublicResXFileCodeGenerator produces code that is marked public
instead of internal.

Moved the file generation code out to a static method so that it can be
shared by both custom tools.
[Win32Debug] Steping over Propeties and NonUserCode
Merge pull request #508 from DavidKarlas/win32StepOverProperty

[Win32Debug] Steping over Propeties and NonUserCode
Merge pull request #503 from Sl0vi/publicresxfilecodegenerator

Add PublicResxFileCodeGenerator
Always displaying first parameter discription in ParameterInfo tooltip

More information at https://github.com/icsharpcode/NRefactory/pull/390
Merge pull request #513 from DavidKarlas/patch-2

Always displaying first parameter discription in ParameterInfo tooltip