improved dynamic task fragment settings

You are now able to hide items
Some Helper-refactoring
Started moving Settings-calls in a special helper

ExportImport
Removed settings from Helpers and moved in MirakelPreferences
Moved settings from PreferenceHelpers in MirakelPreferences
Even more Settings-refactoring
Merge branch 'developing' of github.com:azapps/mirakel-android into developing

Conflicts:
	src/de/azapps/mirakel/helper/TaskDialogHelpers.java
Even more Settings-refactoring
Fixed Bugs related to refactoring