Remove PIL/PySS deps use wx.ScreenDC GetPixel

This is working fine with 2.9.5 now
3.0.1 ATM has some other introduced bug that prevents me testing. Not
related to these changes tho. This branch is ready to merge now. Clear.

Running Python 2
Traceback (most recent call last):
  File
"C:\Python27\lib\site-packages\wx-3.0.1-phoenix\wx\lib\agw\cubecolourdialog.py",
line 2428, in OnPaint
    self.DrawAlphaShading(mem_dc, rect)
  File
"C:\Python27\lib\site-packages\wx-3.0.1-phoenix\wx\lib\agw\cubecolourdialog.py",
line 2449, in DrawAlphaShading
    gcdc =
wx.GCDC(dc)
wx._core.wxAssertionError: C++ assertion "m_handle" failed
at ..\..\src\msw\dib.cpp(580) in wxDIB::CreatePalette():
wxDIB::CreatePalette(): invalid object
Traceback (most recent call
last):
  File
"C:\Python27\lib\site-packages\wx-3.0.1-phoenix\wx\lib\agw\cubecolourdialog.py",
line 2563, in OnPaint
    gcdc =
wx.GCDC(mem_dc)
wx._core.wxAssertionError: C++ assertion "m_handle"
failed at ..\..\src\msw\dib.cpp(580) in wxDIB::CreatePalette():
wxDIB::CreatePalette(): invalid object
Traceback (most recent call
last):
  File
"C:\Python27\lib\site-packages\wx-3.0.1-phoenix\wx\lib\agw\cubecolourdialog.py",
line 2563, in OnPaint
    gcdc =
wx.GCDC(mem_dc)
wx._core.wxAssertionError: C++ assertion "m_handle"
failed at ..\..\src\msw\dib.cpp(580) in wxDIB::CreatePalette():
wxDIB::CreatePalette(): invalid object