FLUID-4908: Fixed the issue that the changes on text size and line spacing are not applied to iframe content since these initial css values are not detectable when the iframe is hidden.
FLUID-4908: Moved the shared facilities required by all UIEnhancer users into the empty UIEnhancer component, as well as improving modelRelay component.
FLUID-4908: Fixed the unit tests.
FLUID-4908: Improved modelRelay component to make sure the source applier points to the same external applier.
FLUID-4908: Inject uiEnhancer defaultActions as a dynamic grade at uiEnhancer instantiation as well as completing the unit tests and updating UIO dependencies json file.
Merge branch 'master' into FLUID-4908
Merge branch 'FLUID-4908' into FLUID-4927
FLUID-4927: Fixed UIOptions unit tests.
Merge remote-tracking branch 'cindy/FLUID-4927' into FLUID-4927-b