MainFrm: Use GetFileName() when saving subtitles.

Fixes cases where URLs are being used as a suggested subtitle filename.
installer: Update Inno Setup's Basque translation.
PPageFileMediaInfo.cpp: Fix mismatching allocation and deallocation.

This was introduced in ecf6198ea30fb8888060360fa650b36c1c67cc69.
Update coverity version.
Update lcms2 to ad2cb04.
WebUI: Update normalize.css.
IsISO639Language: Fix a memory leak detected by Coverity.
Internal filters page: Add buttons to access filters properties.
WebClientSocket: Fixed case where return value of AsyncReader::Length() was not checked.

As reported by Coverity in CID 1084352.
Change PPageFileInfoDetails for consistency.
Audio switcher settings: Fix the spinner not being correctly disabled.

This commit fixes #3428.
Properties dialog: Disable the "Explore to" feature when the file isn't local.

This commit fixes #3440.
Playlist menu: Disable entries that don't make sense for non-local files.
Updated German translation.
Use VS2012 as the default for the builds.

We've been using VS2012 for the nightlies for some time now without any real issues apart from the renderer one which was reported and worked around.
This will allow us to use more C++11 features.

No files are renamed or removed at this point; we'll do this after 1.7.0 is out.
build.bat: tabs to spaces.
Enable LTCG for VS2012 by default for Release builds.

The reason we disabled LTCG in the past was issue https://trac.mpc-hc.org/ticket/2508 which I cannot reproduce with VS2012 Lite LTCG x64 builds so we can assume this is fixed now.
coverity.bat: Use VS2012.
sign.bat: Use VS2012.
Clean-ups in the options.
Update LAV Filters to version 0.58.2-58-edab5dd.

Re-enable the "Resources" tab for MKV files with attachments using a custom patch for now.