Differentiate thread result codes

Signed-off-by: Sup Yut Sum <ch3cooli@gmail.com>
TGitCache: Include result code in Debug String

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

Signed-off-by: Sup Yut Sum <ch3cooli@gmail.com>
Put "TortoiseGit Overlay Icon Server" as the first line of tray icon tooltip

Signed-off-by: Sup Yut Sum <ch3cooli@gmail.com>
TGitCache: Fix possible wrong Context Menu position

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