Add support for Il2Cpp metadata version 29

[ghorsington]

This currently affects Unity versions 2021 and newer. At the moment, the following issues are present:

• Class::init signature lookup doesn't work
• Delegate injection doesn't seem to work either

[Michael-Ziluck]

Heya! Do you have any idea when you might get to this issue? Not necessarily anything definitive, even a vague "it's on my radar, maybe within the next X weeks/months" would even be great. I get that you guys do this project in your free time, so definitely not trying to be a nuisance about this and very much appreciate any and all help.

[ghorsington]

#55 for initial v29 support was merged in and released. Not yet closing this issue though since it requires testing

In terms of BepInEx, Bleeding Edge builds starting version 6.0.0-be.663

[Michael-Ziluck]

@kecleon Looks like this got merged into the main builds! Should be fully good to go now.