Added advanced taskbar grouping and highlighting in Win7

Based on the TortoiseSVN implementation, however, it differs for setting 1 and 2.

Signed-off-by: Sven Strickroth <email@cs-ware.de>
Try harder to get initial groupUUID

Signed-off-by: Sven Strickroth <email@cs-ware.de>
Do not include groupingUUID for showing log of submodules

Signed-off-by: Sven Strickroth <email@cs-ware.de>
Get the right groupingUUID for show log of folder with submodules

Signed-off-by: Sven Strickroth <email@cs-ware.de>
Added TaskbarUUID to Utils project

Signed-off-by: Sven Strickroth <email@cs-ware.de>