Fix Maven Compilation

[hendursaga]

I really don't see how sustainable downloading a huge bundle of dependencies from an external repository and then running a handwritten bash/PowerShell script to compile and package everything is going to be. I see there's a pom.xml file, and have been trying to get Maven to compile and package a working JAR, but the META-INF/MANIFEST.MF file I presume it is copying over as opposed to generating does NOT contain a Main-Class attribute, which I had to manually add. The pom.xml appears to be rather out-of-date, as, among other things, it doesn't seem to include steamworks4j among other dependencies..

[aehmttw]

I'll look into updating the pom.xml soon if I can get a working steamworks4j on maven. For now, the way I recommend building and running the game is via IntelliJ, with main.Tanks as the main class. You can make Tanks.jar be a build artifact with IntelliJ too, including all the dependencies, and it should work.

[ghostlypi]

The bundled build scripts for tanks are the easiest way to build Tanks for any platform. While this does not solve the issue of an up to date pom.xml, it does enable easy building on any platform with a terminal (tested on x86, macOS, and aarch64).

[ghostlypi]

This is a very dead horse, but I finally got around to fixing the maven compilation. Still not optimal, but much cleaner than the old system.