Replace deprecated wxPython constants and class methods

[greyelf]

Replace deprecated/old wxPython constants and class methods to match current 2.8 documentation as well as new 2.9 Phoenix where possible.

Example:
o wx.FileDialog constants like wx.OPEN should be wx.FD_OPEN

[greyelf]

Created branch "i005a_wxpython_usage" based on original upstream tweecode repository as of 14-sep

Commits contained in this branch could be merged in to upstream repository without any side effects.

[greyelf]

Created branch "i005b_wxpython_usage" based on current state.

This branch is NOT safe to merge into upstream tweecode repository as of 14-sep as it changes code that does not yet exist in that repository.

It could be merged into the webbedspace repository as of 25-sep

[greyelf]

Both the "i005a_wxpython_usage" and "i005b_wxpython_usage" branches has be merged into master