Replaces Xmx with a percentage-based argument, in this case leaving 5% overhead.
Resolves issue of container OOM/freezing when all memory is allocated to the java application or when users attempt to use unlimited memory of 0. That's because all the allocated memory is set to Xmx by default. Causes Wings resource overhead allocation to be unnecessary.
Expands Forge installer exit code to provide instructions regarding increasing Wings installer resource limits when using unlimited memory (0) as the default 1024MB is not enough to run the installer.
The percentage is set as a floating point, because of a JDK 8 bug with integers
Changes the paper and spongeforge version variable to be editable by users on the client view. There is no reason to have it as read-only. Other eggs have this value as editable
Changes Paper egg server jar variable input rule to match the other Minecraft eggs. Matches `a-zA-Z0-9_` and `.jar` at the end instead of hard-coded length value of 20.
Fixes#3492
