Remove double spaces from shaders' names in settings.
Use consistent settings names.
Rename "SnapShot" to "Snapshot".
Change old strings to MPC-HC.

Note that the file association related strings are left intact for the time being.
Also the mutex is the same.
Change "Gabest" to "MPC-HC".
Installer: change more strings and remove the old keys when uninstalling.
CMPlayerCApp: Move registry settings from the old to the new location.

Only when we're initializing the MPC-HC key for the first time.
CAppSettings: Add versioning to settings and update any old versions.
installer: set the ExePath after resetting to prevent re-migration.
Merge pull request #111 from mpc-hc/branding-changes
BaseClasses: minor fixes.
Add VS2012 Update 4 RC number.
Move old changelog entries to Changelog_old.txt.
Installer: Add the unofficial English British translation.
custom_messages.iss: cosmetics.

Use a space after the comment character.
AudioSwitcher.cpp: remove double semicolon.
Check return value when it make sense.

Fixes CID #965890, #965892, #965893, #965894, #965898, #1084351
Remove dead conditionals

Fixes CID #965943 #965949
Fix integer overflow

Fixes CID #966079, #966078
Remove unused variables.

Fixes CID #966363, #966530