RFG IntelliJ fixes

[eigenraven]

Update RFG, GTNHMixins with IntelliJ fixes:

• Native run configurations now work again
• Add support for multiple AT files separated by commas, requested by @OvermindDL1
• Add a global override for the IDEA build type without the xml hacks from Improve IDEA integration #132
• There's now a working MCDev plugin for IDEA 2022.3 you can download from https://github.com/eigenraven/MinecraftDev/releases/tag/1.5.23-RFG - uninstall the upstream mcdev and use this fork to get RFG support. Get SRG name, AT entry, etc. all work, including the Mixin plugin

[Glease]

Don't you still need to setup a root output location?

[Glease]

It appears unless someone go implement JetBrains/gradle-idea-ext-plugin#108 we would have to stick to xml hacks.

[eigenraven]

Yeah, I just need to test the imports on projects without and with ipr files on your PR to make sure the xmls get generated correctly in each case.

[eigenraven]

@Glease I now implemented a full solution for adding the project output path that doesn't crash with ipr-format projects. (just using withIdeaXML was enough to trigger a crash in that case, it's probably a bug in the idea-ext plugin)