Bug 17178: Add virtual keyboard to advanced cataloguing editor

Bug 17178: Add virtual keyboard to advanced cataloguing editor

This patch adds Mottie keyboard (https://github.com/Mottie/Keyboard) to advanced editor.

To test:
1) Apply patches
2) perl install/data/mysql/updatedatabase.pl
3) Enable EnableAdvancedCatalogingEditor system preference
4) Go to cataloguing and to Advanced editor
5) Click on Keyboard shortcuts
SUCCESS => the keyboard shortcut "Ctrl-K" should be displayed, with "Toggle keyboard" as description
6) press Ctrl-K
SUCCESS => a virtual keyboard should be displayed, and a new toolbar button labeled "Keyboard layout" should appear.
	=> when you press a letter on both the physical and virtual keyboard, they should be added to the editor.
7) Click on "Keyboard layout"
SUCCESS => a modal should appear, where you can filter and select keyboard layouts.
	=> when you select a layout, it should be reflected on the keyboard.
	=> when you close the modal without selecting a layout, it should keep using the previous layout.
8) Sign off

Sponsored-by: Round Rock Public Library
Signed-off-by: Liz Rea <wizzyrea@gmail.com>
Signed-off-by: Josef Moravec <josef.moravec@gmail.com>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>