Adds miscellaneous platform updates to include templates
via the RequireJS text plugin; to support modification of
asset paths; and to support priority order for gestures.
Supports integration of new API, #1124.
Remove duplicate ClickAwayController implementation that was obscuring actual
implementation. Debounce clickaway action in case toggle is invoked in a
click handler.
Resolves https://github.com/nasa/openmct/issues/888