Remove unus(ed|ual) ssasn function to fix warnings

Why in tarnation would you assign an int to a string anyway?  We're
apparently not using this, so remove it for now.  Should fix a lot of
unused-parameter warnings.
Add skeletal sound driver for JACK

This doesn't make any sound yet, but it creates the JACK client and connects
the requested ports if any.
Add deinterlacing function to RageSoundMixBuffer

JACK processes every channel separately, so we need this.  The audio data is
interlaced all the way back at RageSound::GetDataToPlay(), so this is an easier
hack for now than using deinterlaced until it's needed.
Add MixDeinterlaced to RageSoundDriver

This complements the read_deinterlace function just added.
Add JACK sample rate callback

This will be necessary once we start the decoding thread, which calls
GetSampleRate a lot.
Finish JACK audio driver: now with actual audio!
Fix stereo problem - samples, not frames
Update IRC channel
woooooooooah changelog.

Add yo stuff if I forgot anything (or anyone!).
editor: fix Undo for Alter and Turn menus

Looks like someone figured out the problem, implemented the required
functionality... and then just didn't use it.
editor: fix crash on revert from disk

This still doesn't read in the timing data from disk, but hey, at least it
doesn't crash now.
default theme: fix saving of ThemePrefs

Since this was in a `decorations' layer, the outer ActorFrame was being
stripped along with its OnCommand.
JACK: fix race condition with decode thread

It was possible for the JACK callback to execute before the decode thread had
been started, causing an assertion.
Revert "Hide unneeded pay-related theme elements"

This reverts commit 0dc30d32b4d10257b7ed5f9338c67f89e26742a2.
Revert "Remove Pay mode from Arcade Options menu"

This reverts commit 38ae55f302141c7069ebdecd9a0f67fb2ec3d5a2.
Revert "Remove Pay mode from debug overlay"

This reverts commit 65450ce530d9f80b766d7c28a0a547040201c558.
Revert "Make Pay mode work like Free"

This reverts commit 00e6f6e92449d5655411611fb5f23cd87ddc124f.
Merge branch 'master' into coin-mode
Merge branch 'master' into coin-mode
MovieTexture_FFmpeg: move class defs to header file

No-op.  Should make it a little easier to find things in the FFmpeg driver.