FLUID-4927: Use html5 doctype for new html files.
FLUID-4927: Get rid of the nested expander in fat panel.
FLUID-4927: Removed the old fat panel integration tests which have been re-written with IoC utility.
FLUID-4976: Renamed the base enactor grade from "enactors" to "enactor".
FLUID-4927: Re-organized settings panel grades; created an empty template loader and a default template loader grade for UIO default settings panels.
FLUID-4976: Rename the filename or events that has "enactors" to "enactor".
FLUID-4927: Extracted shared options that are to connect default settings panels with uiOptions into another grade "defaultSettingsPanel".
Merge remote-tracking branch 'cindyli/FLUID-4976'

* cindyli/FLUID-4976:
  FLUID-4976: Rename the filename or events that has "enactors" to "enactor".
  FLUID-4976: Renamed the base enactor grade from "enactors" to "enactor".
Merge branch 'master' into FLUID-4927
FLUID-4927: Comply to the renaming of enactors to enactor.
FLUID-4927: code clean up.