Add missing GUID define for WMV splitting in cffd4fc1705172752c1c7d152f41411a9f41f20c.

Modifying the SDK header instead of ours is a bad idea...
Add a line-break in WMV internal filters tooltip for better readability.
Use Windows line endings for About dialog's "Copy to clipboard" feature.

This commit fixes #3706.
Add VS2012 update 4 version number.
Use pragma once.
Clean up structs/enums.
Update Changelog.txt.
CID 966234.
CID 966348.
CID 966060.
Update to astyle v2.04.
New options.
Update Unrar to v5.0.0.13.