Take StringFound() start parameter as both input and output

Signed-off-by: Sup Yut Sum <ch3cooli@gmail.com>
LocationBar highlights should respect the options in FindDlg

Signed-off-by: Sup Yut Sum <ch3cooli@gmail.com>
CHistoryCombo should be case-sensitive

Signed-off-by: Sup Yut Sum <ch3cooli@gmail.com>
TortoiseGitMerge: Count the number of matches in FindDlg

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