Comment out old ip3k messages menu code to save a query

Change-Id: I13e20590ce5c53ae26cc9e62c5edbe1f14723bb5
Fix wasted check for the wrong timeFormat pref on SN

Change-Id: I396a5990c11c8ad3df989ef1b020e54b04eae841
Change prefs->init() to init a value if it already exists but is undef. This happens a lot on SN and causes extra database queries.

Change-Id: Iebfba16d58fd6037ee840b6a1d859c5a80e51391
Fix date/time display preference on ip3k players

We have some mix of all lowercase timeformat and mixed case timeFormat
preferences on mysb.com. As MySQL treats them the same, but the caching
level does not, some changes never make it to the database, thus are
reset at every player reconnection, or, worse, don't apply at all (when
doen through the web UI).

Add a clientMigrate handler to _remove_ the old preference before
adding it back with the correct name.
Merge branch 'hotfix/timeFormat-preference' into public/7.7
Merge branch 'public/7.7' into public/7.8