Update "Help->Shortcuts..." to reflect recent keyboard shortcut additions

USE CASE: WHAT DO YOU WANT TO DO?

Enable the user to easily find out what all the keyboard shortcuts are.

STEPS TO REPRODUCE AN ISSUE (OR TRIGGER A NEW FEATURE)

Select Help->Shortcuts...

CURRENT BEHAVIOR

There are only 8 shortcuts currently present in the table for Matrix scrolling.

EXPECTED BEHAVIOR

All the currently available shortcuts (those without a "+" in the first column) listed in doc/softeng/Requirements/holistic_modifier_cheat_sheet.txt should be present in the shortcuts table in the interface.

Note, some shortcuts are slated to change. E.g. shift-hover and control-hover currently highlight a row and a column respectively, however the cheat sheet shows that these are slated to be changed to control (row) and option (column) hover highlights. Until those methods have changed, the shortcuts listed in the app should show the current shortcuts (not those slated for the future).

Incidentally, those changes were thought-out to not conflict with future functionality (e.g. shift-click to extend a selection).

DEVELOPERS ONLY SECTION

SUGGESTED CHANGE (Pseudocode optional)

none

FILES AFFECTED (where the changes will be implemented) - developers only

unknown

LEVEL OF EFFORT - developers only

trivial

COMMENTS

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