Tkmacosx

New feature
- Add new feature, *set image as background* in Button widget.
- Add new functions (*hex_to_rgb, check_light_dark*).
- Add XView to Marquee widget.
- Add Radiobutton widget and fix selectcolor issue. (11 )

Enhancement
- Reorganize properties of BaseButton class.

Bug
- Fix broken links.
- Fix anchor of Button widget. (7)
- Fix focusring appearing for all CircleButton.
- Fix activebackground and activeforeground of Radiobutton.

Remove
- Remove colors.py file
- Remove support for python 2.x.
- Remove unnecessary code from multiple files.
- Remove Information.md file.
- Remove tkmacosx/README.md file.

New feature
- Add new [CircleButton Widget](https://github.com/Saadmairaj/tkmacosx/tree/master/tkmacosx#circlebutton-widget) widget.

Bug
- Fix `["key"]` to `[key]` in Marquee.
- Fix Colorvar not working with an item of canvas in 0.1.4.
- Fix `Marquee.play(reset=True)` to reset and play the text from beginning.
- Fix `focusthickness` of button not working when set to 1.
- Fix Image not showing when the button is active.
- Fix Text/Image/Bitmap bleed off the button widget.
- Fix width or height of button widget not working with compound argument.

New feature
- Add new feature `"gradient"` to `Colorscale` widget.
- Add new features to `Button` widget.
- Add new `stop`, `play` and `reset` methods to Marquee.
- Add new feature `avoidmousewheel` to SFrame.

Bug
- Fix height not working with the Button widget issue.
- Fix `foreground` argument not working in the Button widget.
- Fix SFrame, not auto-sizing according to widgets.
- Some other fixes and improvements.

Enhancement
- Redesign classes of widgets.

Remove
- Remove large images.
- Remove *numpy* and *PIL* dependencies.

Bug
- Fix `can't invoke "bindtags" command` error. (3)

New feature
- Add python 2.x support.

Bug
- Fix half HEX issues(6).

New feature
- Add `Marquee` widget.
- `ColorVar` now works with `Canvas` items as well.

Bug
- Fix `ColorVar` not working with the foreground of `tkmacosx.Button`.
- Fix unnecessary `focus_set()` by `tkmacosx.Button`.
- Fix issues with `__main__.py` file.
- Fix issues with `SaveVar()`.