Add description for BitCrusher effect
Revert "Add description for BitCrusher effect"

This reverts commit 62a5cbaf5f6a3c68c3a3ce7217f358b87525e44d.
Merge remote-tracking branch 'upstream/master'
Update credits page.

* Move people who haven't contributed significantly to 1.12 to the past
  developers/contributors list.
Merge pull request #302 from demos/variables_svg

Variables in svg attributes
Show cover art in spinny underneath spinny background.

This means spinny backgrounds should be partially transparent so they
can mask the art.
Merge remote-tracking branch 'upstream/master'
Add tooltips for CoverArt and StarRating widgets to list of available tooltips
Add tooltip for Bitcrusher effect
Add tooltip for Flanger effect
Delete all but the resizable skins for v1.12
Merge branch 'master' of git://github.com/mixxxdj/mixxx into variables_svg
Merge pull request #393 from esbrandt/delete_nonresizable_skins

Delete nonresizable skins
Merge pull request #384 from rryan/credits

Update credits page.
Address review notes for Bitcrusher & Flanger effects
Attempt to improve flaky WPushButton test.
Merge pull request #392 from esbrandt/tooltips

Tooltips
Provide both safe (default) and fast variants of math_clamp()
Use specialized CSAMPLE_clamp() where appropriate
Use math_clamp_fast() where min/max parameters are constants