Player

The script could use some improvements, at the very least adding a reasonable heap size default and `nogui` since there are zero legitimate uses of the server gui thanks to...

The defaults can easily miss the user's expectations, especially for the mc version. A default interactive mode should make this much less error prone.

This bypasses the URL connection for cases where the jar file may not be used after startup. Needs testing (hopefully) fixes https://github.com/FabricMC/fabric-loader/issues/920