Keyboard controls for workspace search

[tracygardner]

• Ctrl + F highlights matching items but there is no way to move focus to them
• Make tab work within workspace search to move between buttons
• Allow Esc to close the workspace search and move focus to the currently selected block
• Should focus use the yellow focus highlight instead of the current colour approach? Decide and implement
• Make sure workspace scrolls correctly
• Add documentation. Include Enter and Shift+Enter for moving through results and Esc for closing search and moving focus
• T should just go to first category in the toolbox, not the toolbox search
• Should Ctrl+F in the toolbox go to toolbox search instead of workspace search?
• Enter in toolbox search results should move to first block in results flyout?
• Should typing in the toolbox enter into the toolbox search? Should it be used to select a category? A combination? Design work needed

[tracygardner]

T should just go to first category in the toolbox, not the toolbox search: #359 (comment)

[tracygardner]

0e8dec2 stopping gizmos preventing propagation of Esc. So Esc now does move focus to the selected block, but it this intuitive?