rename icon accordingly
rename btn to button
 * enhance readability
change orientation in test
 * optimized testing
modify menu entries
 * delete now as own action icon
 * not implemented items now invisible
adapt test accordingly
 * use new delete action icon
Merge branch 'issue#98_testRefactoring' into issue#98

Conflicts:
	catroidUiTest/src/org/catrobat/catroid/uitest/ui/MyProjectsActivityTest.java