Add high dpi images for the ribbon to use: specifying these should help with startup time in high-dpi mode since the images don't have to be resized by MFC

Based on TortoiseSVN revision 24281

Signed-off-by: Sup Yut Sum <ch3cooli@gmail.com>
Block indentation with tab

Based on TortoiseSVN revision 24286

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