Implement locating pre-classic versions of Minecraft

[SpaceWalkerRS]

In pre-classic versions the com/mojang/rubydung/RubyDung class contains the main method.

[sfPlayer1]

I think that's correct

[Juuxel]

As far as I can tell, fixes #714, but this check will fail:

fabric-loader/src/main/java/net/fabricmc/loader/impl/transformer/FabricTransformer.java

Line 30 in 075dbfa

boolean isMinecraftClass = name.startsWith("net.minecraft.") || name.startsWith("com.mojang.blaze3d.") || name.indexOf('.') < 0;

(It also fails for other classic versions since the package is com.mojang.minecraft iirc).

Might be out of scope for this PR, though.

[SpaceWalkerRS]

As far as I can tell, fixes #714, but this check will fail:

fabric-loader/src/main/java/net/fabricmc/loader/impl/transformer/FabricTransformer.java

Line 30 in 075dbfa

boolean isMinecraftClass = name.startsWith("net.minecraft.") || name.startsWith("com.mojang.blaze3d.") || name.indexOf('.') < 0;

(It also fails for other classic versions since the package is com.mojang.minecraft iirc).

Might be out of scope for this PR, though.

thanks for pointing that out, I will open a separate PR for it