Refactor interpreter for linking support

* Create WasmInterpreterEnvironment to hold all modules, functions,
  globals, tables and memories
* There are now three index spaces: "module", "environment" and
  "defined".
  - The "module" index space matches up w/ the normal WebAssembly index
    space, which is distinct for functions, globals, tables, etc.
  - The "environment" index space is a combined index space for all loaded
    modules.
  - The "defined" index space only includes defined objects, not
    imported objects. This is used, for example, when iterating over the
    code section; the function bodies are only specified for defined
    functions.
* A thread is implicitly associated with a module and environment, so
  simplify many function signatures to remove those additional arguments
* Any importable kind can be imported from a host module. Unfortunately,
  since the spec tests require polymorphic imports, the importing
  mechanism must be callback-based
* When interpreting spec tests, the environment and all modules must be
  retained throughout
* Move the binding hash code out of wasm-ast.{c,h} =>
  wasm-binding-hash.{c,h}
* Add wasm_init_output_buffer, for initializing the environment's
  instruction stream independently from a WasmMemoryWriter
* Add wasm_init_mem_writer_existing for initializing a WasmMemoryWriter
  given an existing WasmOutputBuffer
* Add predefined "spectest" module, with a generic function import.
  Still need to implement the spectest table, memory and global imports

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