Think of something to make PlantUML respect -quiet

[sjoerdtalsma]

Is your feature request related to a problem? Please describe.

The option -quiet is supposed to suppress output.
PlantUML is riddled with System.out, System.err and Throwable.printStackTrace usages.

Describe the solution you'd like

Perhaps redirect System.out and System.err towards a umldoclet.log file?

Describe alternatives you've considered

Not sure whether this should only be enabled for quiet mode or not.

Additional context

• Discovered while investigating IllegalStateException at Bibliotekon.getNodeUid(Bibliotekon.java:127) #267

[sjoerdtalsma]

PlantUML 1.2022.7 finally removed all the printStrackTrace usages, replacing it with a custom Logme utility class wrapping a java.util.Logger.

Hopefully the System.out and System.err usages get removed soon too.

[bmarwell]

Great thanks!