Breaking: #79273 - Removed RteHtmlParser proc options
See forge#79273
Description
The following TSconfig options for processing content of RTE fields have been removed:
- RTE.- default. - proc. - dont - Conv - BRto - Paragraph 
- RTE.- default. - proc. - dont - Protect - Unknown - Tags_ - rte 
- RTE.- default. - proc. - dont - Conv - Amp - In - NBSP_ - rte 
Impact
Setting any of these options has no effect anymore.
Content coming from the database towards the RTE will now always keep unknown tags (but HSC'ed), and never have any
double-encoded 
          characters - this was a default since a decade already.
Content stored in the database will now always treat 
        <br> tags as intentional and not treat them like paragraphs, a behaviour which
is common in modern Rich Text Editors.
Affected Installations
Installations explicitly setting 
        RTE., 
        RTE. or
        RTE. might experience different results when editing and saving content via an RTE.
Migration
Remove the TSconfig options, as they have no effect anymore. Any custom implementation which is necessary should be handled via separate entryHtmlParser and exitHtmlParsers in both directions.