Handler.Common
Move away from PersistConf
Get rid of Settings.Development
Strengthen the runtime/compile time settings divide
AppSettings is much more complete
Actually load settings file
Add missing files
detailed-logging
Fix compileTimeAppSettings (use applyEnv)
Get rid of appDevelopment

Motivation: it was a catch-all for a bunch of different things, which
hypothetically should not be combined together. Now we have a separate
setting for each.
Move devel.hs code into Application
Move devel.hs into app subdir
Move SettingsLib into yesod itself
ip-from-header
Remove urlRenderOverride implementation

Replaced with Wiki page:
https://github.com/yesodweb/yesod/wiki/Serve-static-files-from-a-separate-domain
Remove unneeded jsLoader
Cleanup Settings.hs
Make Settings.StaticFiles much smaller
Remove unnecessary widgetFileSettings modifications
Remove messages folder