travis: use wxWidgets binary apt tree
CMakeLists.txt, CheckOptions.cmake: If present use wx3.0 instead of bundled 2.9.3
gcImageControl, UICoreMain: Adapt to wx2.9.5 changes
uicore/Console: use wxTextCtrl instead of wxRichTextCtrl

wxRichTextCtrl uses Html under the hood, but wxTextCtrl is able to do the same stuff without needing HTML support in wxWidgets

This will help us making the built wxWidgets library smaller
cmake/wxWidgets: exclude components we don't need

this makes the wxWidgets library smaller

old wx: 18120278 B
new wx:  5326196 B
diff: -70.6%

old package: 83280 kB
new package: 70708 kB
diff: -15.1%

old time: 36m32s
new time: 28m05s
diff: -23.1%
cmake/wxWidgets: fix compile error with clang with gcc-4.6 stdlibc++