Git does not track directories

Signed-off-by: Yue Lin Ho <b8732003@student.nsysu.edu.tw>
Signed-off-by: Sven Strickroth <email@cs-ware.de>
Document right drag handelr for adding files

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

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

Signed-off-by: Sven Strickroth <email@cs-ware.de>
Prepared release and bumped version numbers to 1.8.7.0

Signed-off-by: Sven Strickroth <email@cs-ware.de>
Rename DLL names to avoid DLL hell, "_tgit" suffix added

SciLexer.dll -> SciLexer_tgit.dll
libgit2.dll -> libgit2_tgit.dll
zlib1.dll -> zlib1_tgit.dll

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