Updates the forge egg to use the json api from forge to get versions instead of the old way of scraping the site and getting invalid jar files.
Also updates to validate download links.
Allows for setting a specific forge version
The GET_VERSIONS Grep Command will fail with 1.12.2 but will work with 1.12. Added optional check for 3rd decimal place in the MC Version of Forge and future proofed the forge version for Double Numeric SubMinor version.