Migrate from Retrofit to KTOR

[Kr0sFyr3-Q42]

Why?

• Ktor is multiplatform and more modern
• Ktor uses suspend functions by default

How

Was already implemented in a project that was based on this template, so could be a nice inspiration.
Fully working, but was not merged because it was tied in with the use of OpenApi-generator, which did not work out and was a blocker

https://github.com/Q42/Museumvereniging.Android/tree/openapi-generator

You may ask @ninovanhooff if you don't have access to the link above

Ktorfit

Since we currently use Retrofit, Ktorfit might fit well within our architecture

• https://foso.github.io/Ktorfit/installation/
• https://github.com/Foso/Ktorfit

[Frank1234]

nice! and the niceties, like error parsing and so on are also in MuseumVereniging? @ninovanhooff