Merge remote-tracking branch 'origin/5.7.x'

Mac and Linux Support

Merge remote-tracking branch 'origin/5.6.x' into 5.7.x

Linux support and minor refactor

Mac Support

5.7 upgrade

Const-correctness across codebase

Merge tag '5.6.0'

5.6 upgrade; upgrade warnings solved

removed some tangling pointers and reduced headers

updated marketplace url

Update README.md

Update README.md

FilterPlugin upd

Fab marketplace prep