Update depends on file in migration

This ext depends on changes made after beta4 was released. It depends on changes that came with the ACP Contact Admin form, so I'm changing the 1st migration to depend on that change's migration. Maybe this should be changed again to beta5 later on, but for now this could prevent installs on out-dated versions of phpBB (which have already occurred).
Add colpick to background color field
Merge pull request #12 from VSEphpbb/updates/migration

Update depends on file in migration
Update color picker listener script
Correctly retain color picker settings
Merge pull request #13 from VSEphpbb/experiment/colorpicker

Add colpick to background color field in ACP
Return early when announcement is disabled
Refactor listener for readability
Correct overflow setting, use auto instead of scroll
Merge pull request #14 from VSEphpbb/updates/improvements

Return early when announcement is disabled
Merge branch 'refs/heads/master' into updates/testing