ARSC/AXML Parser Rework

[iBotPeaches]

• Remove assumptions of order of RES, XML and TYPE chunks
• Rework StringBlock to not be responsible for header reading
• Ensure unification between ARSCDecoder and AXMLResourceParser
• Support NULL chunks
• Add handling for common protection techniques that re-order/re-size elements

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This is a major (10yr overdue) refactoring of the core processing of AXML/ARSC in Apktool. This removes the logic that required chunks to be in a specific order as well as revamps chunk loading to handle unknown data reading to survive common obfuscation techniques.

We may have regressed some things, but I'd rather get this merged with the cleaner and more understood codebase and iterate on discovered regressions.