Calendar: Support for deleting events (rest of the features)

 * Includes highlight for selected items.
 * Spinner-style select all, deselect all.
 * Improvements asset files updated.
 * Add the TW strings for it.
 * Show the delete events menu as the config.

Conflicts:
	res/values-zh-rCN/cm_strings.xml
	res/values-zh-rHK/cm_strings.xml
	res/values-zh-rTW/cm_strings.xml
	res/values/cm_strings.xml

Change-Id: I1781bd8748487bc51da8988f7ae74927c0e179c1