Update files for v1.6.8.
Bump version to 1.6.9.
Add astyle functionality to pre-commit hook script

It supersedes checkyear.sh while preserving all of its functionality.
Added astyle functionality is disabled by default and should be enabled
manually.
Merge pull request #52 from alexmarsev/pre_commit

Add astyle function to the supplied pre-commit hook script
DSUtil: Add a helper class for CoInitialize.

This ensures that CoInitialized is always called if CoInitialize is successful.
VobSubFile: Fixed creation of a custom palette with Matroska

Fixes rendering of vobsubs in Matroska when the custom colors
feature was enabled.

Backport of MPC-BE commit 1995