first version of MainMenuActivity Design

* add icons
* correct padding left and right
* correct colors
refactor to remove lint warnings

* remove unused dimens
* remove unused colors
add color to program in continue button
Merge branch 'master' into MainMenuActivityLayoutFinetuning
Merge branch 'master' into MainMenuActivityLayoutFinetuning
refactoring MainMenuActivity

* remove teststyle bold
* remove background pattern
Merge branch 'master' into MainMenuActivityLayoutFinetuning
Merge branch 'master' into MainMenuActivityLayoutFinetuning

Conflicts:
	catroid/res/values/colors.xml
resolve conflicts in res folder
Merge pull request #191 from Catrobat/MainMenuActivityLayoutFinetuning

Main menu activity layout finetuning
Issue #112 almost complete.