[TYPO3-Solr] Custom Index on tt_content is not refreshe automatically

[Holger]

changed lines are marked with // aenderung Holger

I think it would be a good idea to have the option to have a custom recordmonitor that can be configured via typoscript.
What do you think about that? 

Or would it be an option to have a flag in typoscript that sets tt_content to be treated as "regular" table?
As a conseqence of this in the recordmonitor class we would need some kind of if or case that takes the flag into account.

Regards Holger