Despector cannot handle duplicate fields

[mikroskeem]

Exception in thread "main" java.lang.IllegalArgumentException: Duplicate field a
	at org.spongepowered.despector.ast.type.TypeEntry.addField(TypeEntry.java:321)
	at org.spongepowered.despector.decompiler.BaseDecompiler.decompile(BaseDecompiler.java:181)
	at org.spongepowered.despector.decompiler.JarWalker.scanClassFile(JarWalker.java:81)
	at org.spongepowered.despector.decompiler.JarWalker.scanJar(JarWalker.java:72)
	at org.spongepowered.despector.decompiler.JarWalker.walk(JarWalker.java:55)
	at org.spongepowered.despector.Despector.main(Despector.java:203)

Not that important, but fixing this means Despector is step closer to decompile obfuscated code 😄

[jamierocks]

This issue here is that Despector only uses field names, when a field can (in bytecode) exists with a different type, but same name