Fix wrong path in history when opening files from a network drive.

This old bug has been made visible because of 3fc006ff775f7bf8c29da82c33069d47f6ea47ea.

This commit fixes #3594.
About dialog: Keep the build info in the clipboard even when MPC-HC is closed.
Factorize the code for file chapters handling.
Factorize the code for DVD chapters handling.
Skip to previous chapter: Use the same threshold for files and DVDs.

Previously thresholds of 3 seconds and 7 seconds were used respectively for files and DVDs, to choose between restarting a chapter or skipping to the previous one. Now both uses a 5 second threshold.
player.html: remove width completely.

It's handled in JS.
Enable per-monitor DPI-aware on Windows 8.1.

Fixes #3356.
temp
Use ZeroMemory on more places instead of {0,0}
Fix NULL handle passed as parameter.
Update Git to 1.8.4.
Cleanup
cleanup
cosmetics
Be consistent with the var type.
Update SoundTouch to 1.7.2 r173.
Update Changelog.txt.