Improve class file parsing
- Perform BE-to-LE conversion for all integers
- Add support for overloaded method lookup
- Add asserts for constant pool indices and tags during lookups
- Add missing
free()s - Add asserts to all
fread()s andmalloc()s - Combine constant pool and methods into a single struct
- Move calls to class-parsing functions out of
main()into aget_class()function