PSSVG as a Microservice

[StartAutomating]

Given its web-friendly nature, PSSVG should be available as Microservice.

Largely speaking, this should only return .svgs, and should cache any input.

For the sake of brevity and structural sanity, this should utilize the extended types system (see #175)

• [ ] #182
• [x] #183
• [ ] #184
• [ ] #196
• [ ] #203