Support for getDeclaredField and Class#forName in reobfJar

[PlayerSchark]

Due to some nested classes in NMS are package-private it should be possible that Class#forName and Class#getDeclaredField are supported by the reobfJar task.

Example:

Class.forName("net.minecraft.network.ConnectionProtocol$PacketSet").getDeclaredField("classToId") should be reobfuscated to: Class.forName("net.minecraft.network.EnumProtocol$a").getDeclaredField("b")

or:

Entity.class.getDeclaredField("tickCount") should be reobfuscated to: Entity.class.getDeclaredField("ag")

It seems that SpecialSource already supports it in its RemapperProcessor.

[electronicboy]

It's worth noting that there are already libraries to handle this at runtime, https://github.com/jpenilla/reflection-remapper

I'm not sure if this is something we will bother with, given our intent to move away from relying on remapping in the future

[MiniDigger]

we are in the process of building out tooling for the other direction, obf reflection calls -> mojang mapped source, since paper will ship mojang mapped jars per default in the future, so I dont see this being added to paperweight-userdev