Recommended memory/PermGen settings per modpack

[oxguy3]

This feature would allow modpack makers to set recommended min/max memory and PermGen levels in their modpack.json files. If the user attempted to run the modpack with less than the recommended memory/PermGen, a pop-up would appear, asking them if they wanted to increase to the recommended levels. The pop-up would also have a checkbox allowing them to permanently disable the pop-up, and the Options menu would have a checkbox to toggle the pop-up as well.

[smenes]

nice idee!

you can also disable PermGen if you are running JRE 8 since is no longer use with java 8

and the possibility to notify in your pop-up to use java x64 instead of java x86, it's required by some mods