Add Plantuml (Apache Licensed) sources to project, version 1.2019.11
Add Plantuml (Apache Licensed) sources to project, version 1.2019.11

Signed-off-by: Sjoerd Talsma <1dafb4c4a7acdc6e1eca32ff35fda03e0e9cd976@talsma-ict.nl>

talsma-ict/umldoclet,talsma-ict/umldoclet