Refactor to use BinRW

[prockallsyms]

• Replaces the nom parser with binrw for all class file parsing, adding the ability to patch+write class files
• Adds some typed attribute variants missed on my last PR, including Java 9+ Module attributes, Java 11+ NestHost/NestMembers, and Java 16+ Record/PermittedSubclasses
• Adds jar-utils feature for reading, writing, and modifying JAR archives with manifest parsing
• Adds spring-utils feature for Spring Boot fat JAR/WAR detection, application class enumeration, nested JAR access, and classpath.idx/layers.idx parsing
• Adds patching API: sync_from_parsed(), sync_counts(), sync_all(), instruction replacement/nop-out helpers, and constant pool addition helpers (add_utf8, add_string, add_class, add_name_and_type, and deduplicating get_or_add_* variants)
• Adds higher-level navigation helpers on ClassFile (get_utf8, find_method, find_field) and MethodInfo (code(), code_mut(), with_code())
• Adds TUI JAR explorer example (examples/jar_explorer.rs) with tree view, vim-mode viewer, class file disassembly, and manifest/hex/nested-JAR formatting
• Removes all nom parser files (src/parser.rs, src/*/parser.rs)
• Expands test coverage (108 tests total) for new features and parsing logic
• Adds a decompilation feature

[Palmr]

The branch has conflicts, any chance you can do a rebase?