Error logs now properly print to stderr when possible
Colour-coded logs
Addressed a scenario in which outgoing packet writes could get hung up
Fixed interface incorrect definition message on server startup
Unified kotlin and java into just src/main
Unified the rs09 and core packages
Took all content out of the core package, and placed it into the new content package
Reorganised all source code relating to content to be easier to find and explore
Bumped version of build plugins to latest
Increased maven build heap size to 1024m as builds were starting to run out of memory
Added missing version number to build plugin, fixes build warning
Now possible to use the debugger again. Instructions for use will be added in the upcoming README refactor (in short, add a maven build config that runs "compile exec:java")