Use official zlib repository

Signed-off-by: Sven Strickroth <email@cs-ware.de>
No need to compile OGDF augmentation, decomposition, energybased, external, incremental, labeling, lpsolver, misclayout, orthogonal, simultaneous, tree, upward

Signed-off-by: Sup Yut Sum <ch3cooli@gmail.com>
Allow TortoiseGit.dll to be loaded directly by TortoiseGitExplorer.exe

Signed-off-by: Sup Yut Sum <ch3cooli@gmail.com>