Fix setup.py: include all relevant packages and files
Fix usage of wxversion for py2exe/PyInstaller
Ignore 'wx' being imported before 'madgui.core'

To make applications work that make use of 'madgui' but prefer a custom
'wx'/'matplotlib' setup.

NOTE: currently, in this case must manually reset 'matplotlib.use'
according to your needs *after* importing 'madgui.core'.
Merge branch 'hotfix-setup'

- fix incomplete package/data list in setup.py [HOT]
- fix bundling with py2exe (remains to be tested)