Add more keyboard shortcuts

[mrkam2]

Here is a list of actions and recommended keyboard shortcuts for them:

• Focus on Quick Jump - Cmd-K
• Focus on Search - Cmd-F
  • Search forward - Cmd-G
  • Search backwards - Shift-Cmd-G
• Focus on Search by Identity - Cmd-I
  • Next search by identity - Cmd-]
  • Previous search by identity - Cmd-[
• Start/Stop recording - F5 or Cmd-R
• Copy the current value in Inspector (consider File and its str-ed form) - Cmd-C
• Tap in inspector - Cmd-T
• Def in inspector - Cmd-D
• Step Forward - F11 or Cmd-;
• Step Backwards - Option-F11 or Shift-Cmd-; (I wish Shift-F11 was available for backwards step, similar for backwards search, but it is taken by Step Out, so I picked Option instead).
• Step to the next interesting expression in the same frame - F10 or Cmd-'
• same backwards - Option-F10 or Shift-Cmd-'
• Step Out - Shift-F11 or Cmd-Up

Add them to tooltips/menu items for easy discovery.