[FEATURE] IRRE useCombination option to modify warning text

Add support for inline elements in combination with
['appearance']['useCombination'] to suppress the warning
messages by using ['appearance']['suppressCombinationWarning']
or ['appearance']['overwriteCombinationWarningMessage'] to
overwrite the default message.
(allows LLL: values)

Change-Id: I0765b9316cdfa9e09eb6eaf4e366c9470bfb7d75
Resolves: #64535
Releases: master
Reviewed-on: http://review.typo3.org/36415


Reviewed-by: Daniel Goerz <ervaude@gmail.com>
Tested-by: Daniel Goerz <ervaude@gmail.com>
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>