announcements 5.x-1.0-alpha3

Corrected help links.
Corrected content type.
Corrected settings path.
Added default interval setting.
Corrected names in function calls.
Changed date conversion to bypass drupal calls.
#255726 by NancyDru for melsawy - fix alias case, menu name.
Clean up module info.
Improve doxygen.
Improve default announcement interval.
Better add type description.
Improved block styling.
Refreshed translation template.