0.9.2-alpha Fix several critical latency bugs

This fixes a long-standing bug where lag abruptly occurs after a certain amount of time passes (see the description of #70).

v0.6.3 remains the latest "stable" release, but this is probably comparable. More load testing is required to tell for sure.

Known bugs:

• #72 At the end of load tests, the server lags significantly when users leave the server.
• #71 Stale/inactive users are not getting timed out correctly.

What's Changed

• Add CompiledFlags by @hopskipnfall in #69
• Upgrade Kotlin version, remove some sources of lag by @hopskipnfall in #70

Full Changelog: 0.9.1-alpha...0.9.2-alpha