#3359118: Allow table cells to have text formats applied
Allows cells in formatted tables to have a text format applied to the contents.
- Adds use_text_formatandtext_formatconfig to FileTableFormatter
- Passes config through to FileTableFormatterProcessor
- FileTableFormatterProcessor takes format and, if it's set, applies it to the table cell contents
- Applies to headers too since it uses the same processing
 
- Add schema file with FileTableFormatter schema definition
- Pass services used in FileTableFormatter via createmethod
- Bit of PHP type enforcement
Edited  by Geoffrey Roberts