SrgToMcpRenamer uses hardcoded path for nested jars

[Su5eD]

The Issue

Currently, only nested jars under the META-INF/jarjar/ directory are deobfuscated by SrgToMcpRenamer.

InstallerTools/src/main/java/net/minecraftforge/installertools/SrgMcpRenamer.java

Line 132 in dd66a7d

processors.add(new ZipEntryProcessor(ein -> ein.getName().startsWith("META-INF/jarjar/") && ein.getName().endsWith(".jar"),

While this is the most common folder for nested jars, JarJar metadata defines nested jar paths as paths relative to the outer jar's root, and therefore nested jars can be located anywhere in the jar. This breaks mods that place their nested jars in other paths than the mentioned folder.

Expected behavior

SrgToMcpRenamer is able to deobfuscate any nested jars regardless of their location, as specified by JarJar metadata. Rather than assuming all nested jars are in the META-INF/jarjar/ directory, we should open the jar's JarJar metadata file and read nested jar paths from it.