Merge branch 'feature/rich-text' into 'torominosocial'

rich text support

See merge request pleroma/pleroma!309 (merged)

(cherry picked from commit a26d5e6b)

6aa65b68 common api: add support for formatting messages outside of twitter-style plain text e7871ed0 tests: add tests for evil HTML filtering

enabled an automatic merge when the pipeline for be07c5bb succeeds

merged

mentioned in commit 855b7c06