TortoiseGitMerge: Add Edit Commit context menu in right view

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

Signed-off-by: Sup Yut Sum <ch3cooli@gmail.com>
TortoiseGitProc sendmail command supports to, cc, subject command line arguments

Signed-off-by: Sup Yut Sum <ch3cooli@gmail.com>
Input comment message and call TortoiseGitProc to sendmail

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

Signed-off-by: Sup Yut Sum <ch3cooli@gmail.com>
[WIP] Make it work when hiding the send mail dialog

Signed-off-by: Sup Yut Sum <ch3cooli@gmail.com>
Can include patch in email

Signed-off-by: Sup Yut Sum <ch3cooli@gmail.com>
Can include relevant part of patch in email

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