Changed command system (#304)

* Save Cacheable expansions data on shutdown

* Prepare for 1.16

* 1.16.1 is out apparently

* Further fixes, still not done

* Inline JSONMessages & fix for 1.16

* Done :O

* Done for real now, (hopefully)

* Changed to static instead of DI for plugin instance

* Cleanup

* Modified tab completions. Removed extra command.

* Apparently this is needed

* Started cleaning stuff up

basically just pushing so I can continue on laptop

* did more cleaning, probs like half way done

* more cleaning. reverted back to a min arg system somewhat similar to what frosty had, but less boilerplate.

* Started debugging and fixing runtime/compile errors

* Fixed bugs, still needs thorough testing

* Re-enable metrics

* relocated stuff again

* - Remove json message relocation
- uncomment other relocations
- reformat pom
- remove useless scope declaration
- Fix metrics constructor
- Switch commands to use inline json message

Co-authored-by: iGabyTM <contactgabytm@gmail.com>
Co-authored-by: darbyjack <admin@glaremasters.me>
Co-authored-by: PiggyPiglet <noreply@piggypiglet.me>

src/main/resources/plugin.yml

@@ -1,7 +1,7 @@
 name: ${project.name}
 main: me.clip.placeholderapi.PlaceholderAPIPlugin
 version: ${project.version}
-api-version: 1.13
+api-version: '1.13'
 authors: [extended_clip, Glare]
 description: ${project.description}
 permissions: