Bug 21411: Advanced cataloging editor - rancor - Allow configuration of Keyboard

Bug 21411: Advanced cataloging editor - rancor - Allow configuration of Keyboard

This patch allows for redfining the keyboard shortcuts used in rancor.
For now these are set globally (per instance)
Ctrl-S is a codemirror setting and cannot be altered

To test:
 1 - Apply patches
 2 - update database
 3 - Load the advanced cataloging editor
 4 - Click the "Keyboard shortcuts" button
 5 - Ensure the list looks correct
 6 - Note that 'Ctrl-S' note sit cannot be remapped
 7 - Note the 'Redefine shortcuts' link at the top of the menu
 8 - Confirm all the listed shortcuts work as expected
 9 - Click the 'Redefine' link
10 - Ensure current mappings load correctly
11 - Read explanation and verify it makes sense
12 - Remap some functions
13 - Return to the cataloging editor
14 - Confirm your mappings work

Signed-off-by: Liz Rea <liz@catalyst.net.nz>
Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
Signed-off-by: Nick Clemens <nick@bywatersolutions.com>