* Implement first response parts of http caching
* Implement cached response for static resources
* Implement HTTP caching for json responses
* Fix last seen value for online players
* Implement http caching for pages (.html)
* Use placeholder cache even with async requests.
Affects issues:
- Close#2813
Some issues that were identified:
- Going to /debug/ makes the style requests return the debug page content
because the /debug resolver is used
- In the future when / is to be resolved it might override a bunch of requests.
- Use of RequestTarget as incompatible with URIPath for some reason which lead to infinite
redirect, so the attempted change was reverted before this commit.
- Some Responses are using PlanFiles to obtain a html file (SRP violation)
Rest of the pages still use the old resolution that is now deprecated.
Reason: Parse means extracting information - In many cases the word was being
used wrong (In Finnish 'parsia' means 'to patch together', which caused
the wrong use)
The word 'parse' replaced with 'build', 'create' or 'generate' where appropriate
Aurora Lahtela
Rsl1122
Rsl1122