Add modifier keys to keyboard shortcuts

[Robert Leach]

USE CASE: WHAT DO YOU WANT TO DO?

Use modifiers keys with keyboard shortcuts (arrow keys, +/-, etc) the same way modifiers work for the buttons and the mouse navigation actions.

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

1. Scroll with the arrow keys with various modifiers
2. Zoom with the +/- keys with various modifiers

CURRENT BEHAVIOR

Modifier keys do not do anything to the keyboard shortcuts

EXPECTED BEHAVIOR

Modifier keys should be able to speed-up, slow-down, etc. the shortcut operations.

DEVELOPERS ONLY SECTION

SUGGESTED CHANGE (Pseudocode optional)

Implement the modifiers as specified in the holistic modifier plan in issue #70.

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

MatrixViewController

LEVEL OF EFFORT - developers only

medium

COMMENTS

See comments on lines 289-302 of MatrixViewController of PR 14.

[Robert Leach]

Removing milestone: Navigation (automated comment)