Related to #1220 - keyboard bindings/mnemonics (#1221)

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* Add constant for platform specific mnemonic for menu shortcuts.

Modify top level menu elements with the shortcuts.

* Add global hotkey to show keyboard shortcuts

* Apply updates to mnemonics in menu bar allowing for alt-shortcuts

* Mod to color a :focus tab, for visibility when tabbing through controls

* Revert tabs style changes, focus F1 functionality for non-mac devices

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