show amount of selected items in ProjectActivity
 * on delete ActionMode
add TestUtils method to accept action and close ActionMode
 * adapt test for SoundFragment
enhance testing of delete ActionMode
 * based on SoundFragment test
 * optimization
correct names for members and constants
fix bug
 * update title only for delete ActionMode
refactor tests of ProjectActivity
 * new TestUtils method to get into ProjectActivity
 * 2 test sprites in set up
 * remove createProject method
 * essential test adaptions
fix wrong names