add support for existing GDataXMLNode in all persisting methods

Signed-off-by: Ralph Samer <ralph.samer@student.tugraz.at>
functionality to pretty print XML

Signed-off-by: Ralph Samer <ralph.samer@student.tugraz.at>
move toolbaritems closer together

(as agreed with Dominik)

Signed-off-by: Ralph Samer <ralph.samer@student.tugraz.at>
adopting height for TVC-Section-Headers in ProgramTVC and for TableViewCells in ObjectScriptCategoriesTVC

Signed-off-by: Ralph Samer <ralph.samer@student.tugraz.at>
new TableViewController (ObjectNewScriptCategoryTVC) that handles adding new bricks to ObjectScriptsTVC

Signed-off-by: Ralph Samer <ralph.samer@student.tugraz.at>