Add text markup information after FoLiA-correct

[proycon]

FoLiA-correct doesn't add text markup information, but FLAT relies on this to properly display TICCL output (proycon/flat#92). Add foliatextcontent (proycon/foliatools#32) to the end of the PICCL pipeline if no further tokenisation or linguistic enrichments are selected, this tool will automatically add the necessary text markup linking to the strings, with support for the corrections.

[proycon]

(this relates to @pirolen's use-case)

[proycon]

Release of this new feature is currently blocked by proycon/folia#88, an issue which popped up because of this and needs to be resolved first.