Move to default Maven source location
Build mod using SpecialSource instead of MCP

Removes dependency on MCP for building this project.
Instead, building against Minecraft+Forge obf2pkgmcp library,
and also IC2 obf2pkgmcp - as dependencies, deobfuscated with
SpecialSource (see comments).

After building, reobfuscates pkgmc2obf, also using SpecialSource.
End result is the finished mod you can install.

Works, but could use further groundwork to fully automate!