* interface for progress class
* adjust branch overview
* adjust git pack
* adjust diff page
* adjust objects class
* adjust activation class
* adjust repo online class
* adjust serialize class
few methods moved
* adjust tadir class
* Optimized git object handling
- Introduced secondary indices for ZIF_ABAPGIT_DEFINITIONS=>TY_OBJECTS_TT to allow fast access to git objects by SHA1 and TYPE
- Added a new column INDEX to ZIF_ABAPGIT_DEFINITIONS=>TY_OBJECT to allow reconstruction of the correct sort order of git objects when after processing in ZCL_ABAPGIT_GIT_PACK
- Optimized git object accesses in ZCL_ABAPGIT_GIT_PACK, ZCL_ABAPGIT_GIT_PORCELAIN and ZCL_ABAPGIT_MERGE by using the newly introduced indices
* Removed excess fields
Removed excess fields from secondary index definitions of ´ty_objects_tt´, since they are not required.