updated snapshot

As I’ve been working on IDLE improvements, I’ve been keeping a running snapshot of my current version here:
	https://github.com/roseman/idle <https://github.com/roseman/idle>

As of now, this includes:
- tabbed shell/editor windows
- incorporate ttk into various places when available
- new redesigned ttk-based, modeless preferences/options window
- new redesigned, modeless about window
- new modeless rich-text 'idle help' window
- redesigned 'ask' modal dialogs (e.g. go to line, open module, etc.)
- cosmetic tweaks to editor window, status bar, etc.
- fix positioning of several yes/no/cancel etc. type of dialogs
- fix windows not showing text found via dialogs until dialogs closed 
- fix calltips not working on mac
- fix debugger and editor context menus not working on mac

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