* Use a member reg variable to reduce the registry accesses
* Use defines instead of hardcoded values

git-svn-id: http://tortoisesvn.googlecode.com/svn/trunk/src/TortoiseMerge@25053 4cfb86a4-2c7a-11df-bd14-c1e331e6ceac
Use custom drawn icons for the new tabs/spaces commands.

git-svn-id: http://tortoisesvn.googlecode.com/svn/trunk/src/TortoiseMerge@25055 4cfb86a4-2c7a-11df-bd14-c1e331e6ceac