Add hotkeys for commonly used buttons

It would be nice not to have to move the mouse between the buttons when you're just hitting the same couple of buttons over and over again. I'd like to see commonly used buttons with hotkeys (You have it for Reset in the play mode, but that appears to be it).

Some ideas are:
-Use Spacebar or S for toggling play/pause in replay mode
-Use A and D to rewind or fast forward the replay
-Use Q and E and/or left and right arrows for stepping through frames one by one
-R for "Retry" at the "Fail" menu
-E for "Editor" when that button is visible in play mode.
-Etc.
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