* 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
* Updated all references to use the getDataDirectory function from misc so that an environment variable can be set for the data directory.
* Did some minor code formatting cleanup
* Got rid of some unused vars
* More unused var cleanup
