Upgrade to BEYOND Java 8

[KingRainbow44]

At the moment Grasscutter is locked to Java 8. (if this isn't true, someone let me know) The reasons for this are:

• The MongoDB mapper (at its current version) is not compatible with Java versions beyond 9.
• The client seems to not be able to connect to the game server

I've already attempted updating the MongoDB wrapper to 16 with success, but the second issue is still applicable. Worst case scenario: the KCP server will need updating to support newer versions of Java. Best case scenario: I screwed something up while trying to update.

If anyone wants the updated database wrapper, let me know!

EDIT:

• [ ] Refactor KCP system
• [ ] Refactor dispatch system With both of these, Java 8+ should be supported just fine.

[KingRainbow44]

Another good reason for doing this is because it seems people in the #support channel have a ton of issue with the Java version, since most have a newer version installed/don't know how to multiple versions of Java at the same time.

[MlgmXyysd]

• The MongoDB mapper (at its current version) is not compatible with Java versions beyond 9.

Can we migrated it to MySQL?

[KingRainbow44]

Can we migrated it to MySQL?

the idea isn't to migrate database (since the entire server literally RELYS on the mongo wrapper) and besides like I said, I already have the wrapper working on Java 16

[4Benj]

Can we migrated it to MySQL?

for the type of data we are saving MongoDB is more suitable in my opinion

[KingRainbow44]

Finished with #130!