Created a backend system for the window-input management. So now it will be a los easier to port to another windows library/platform.
Since this is a big commit, it's probably that some bugs where introduced, but i tested all that i could, and it's working fine.
I'll probably add a cursor manager backend because right now there is no cursor management at all, i removed the CreateCursor function because it was unusable.
Added Icon possibility to cUIPushButton.
Added default fonts for ui themes and global default font for all ui themes.
Changed how cUIGfx get shapes, now accept a new instance without shape.
Fixed how padding works on cUITextBox and cUITextInput.
Fixed font rendering in cTextCache when some text rendered with angle or/and scale ( it was breaking the model view matrix ).
Fixed a miscounting of the number of vertex for the cached text.
Fixed HaikuTTF destroy singleton ( now release fine the memory ).
Added debug helper functions.
Fixed some skin state changes.
Improved UI performance.
Changed EE_PLATFORM_WIN32 for EE_PLATFORM_WIN, and added as platform WIN64.
Added detection of 64bits compilation.
Implemented some asserts.
