gscreen -improve keybinding

now all the jogging keys behave the same.
in incremental jogging mode auto key repeats are ignored.
added F1 for machine on
fixed escape for estop
shift I is handled properly for jogging increment changes
changed up/down for Z axi,s left/right for x, and page up/down for y
gscreen -fix data entry into offsets page.

Jogging keybinding was interfering.