Clean-up Imports

[aaronayres35]

These are directly lifted from https://github.com/enthought/enable/blob/master/TODO.txt

• Clean-up the failing import of enthought.freetype in
  kiva.trait_defs.ui.wx.kiva_font_editor.
• Clean-up imports of enable (I mean NOT enable2) done in:
  enable2/traits/ui/wx/enable_rgba_color_editor.py
• Clean-up direct imports of traitsui.wx

The first two I believe are no longer relevant (?)

[rahulporuri]

Clean-up direct imports of traitsui.wx

I'm not entirely sure what you mean by this. Do you mean that we should use the toolkit object to get the relevant object, instead of importing it manually from the specific toolkit?

[aaronayres35]

Clean-up direct imports of traitsui.wx

I'm not entirely sure what you mean by this. Do you mean that we should use the toolkit object to get the relevant object, instead of importing it manually from the specific toolkit?

TBH I'm not entirely sure either, this was directly pulled from a TODO.txt file that hadn't been touched in a few years:
https://github.com/enthought/enable/blob/118a04a8a92d79bcef71fee8c55ee0aad6a07e07/TODO.txt

Going through toolkit_object from traitsui seems to make sense to me though and is probably a behavior we are trying to encourage?