moved menu inflating and handling of base menu items into BaseActivity

fixes CAT-1055
Implemented FaceDetection and Camera support
Fixed FaceDetection
compatibility of Led Brick (Singleton Camera)
Merge pull request #1081 from Catrobat/restoreFacedetection

Restore facedetection
Merge pull request #1076 from Catrobat/CAT-1055

[CAT-1055] Complete [overflow] menu entries on all screens
cat-1055 #fixed
merge with master; fixed strings; added German strings