* Get rid of old Account.getxxxFolderName() calls.
* Clean up any call sites to them
* Properly rename the existing special folder name identifiers
* Use a hash table in MessagingController to improve identification
of special folders for IMAP accounts
* Fix a bug in Controller, which was creating new server-side folders
using localized names.
* Fix a bunch of code in Controller that was using mContext, instead of
using mProviderContext to support testability.
* Fix broken unit tests in ControllerProviderOpsTests
Fixes bug 1904373
for new accounts to "1 day". (2) Remove "all" from the list
of available lookback window sizes, to prevent runaway
during our simplistic sync model.
BUG=1789913
Automated import of CL 148376
1. Generalize the code for the various spinners that control
account check frequency.
2. Provide an API for looking up store attributes (and refactor
existing instatiateStore logic to use it).
3. Cleanup the old code that was used to setup frequency spinners.
4. Hardwire Exchange accounts to default into push mode.
Notes to tester:
1. For each account type (POP, IMAP, EAS) we need to check that
auto & manual creation "do the right thing" for frequencies.
POP & IMAP should offer "none" or time intervals, while EAS
should offer "push", "none", or time intervals.
2. EAS accounts should default to "push", all others to "15 min"
3. Make sure that you can edit existing account settings and see
the right choices (only EAS should be offered push).
4. I couldn't write an automated test for the mail checker service,
please confirm that POP & IMAP accounts are checked at the right
intervals (or never, if set for "none".)
BUG=1776149
Automated import of CL 144953
