wasm: update to wat syntax as of Jan 2019.
Examples:
- get_local -> local.get
- i32.wrap/i64 -> i32.warp_i64
- etc
The distinction between wat and wast has been clarified:
- wat: textual format for web assembly modules
- wast: superset of wat used in the specification to define tests.
Drop platform_js and use refactor platform_os to support JS mode. Add
get_time_ms import to platform_os so this depends on run.js and
fooboot providing that.
- Use more concise param and local syntax.
- Separate out string.wam.
- Add pr_str_seq functionality and add in print_readably
functionality.
- Add REPLACE3 function.
- Remove use of putchar and simplify util.wam
- Move string functions from util.wam to string.wam including some
renames to be more consistent with C library names.
- Add temporary content to 256 character buffers so that they are
de-duplicated/combined.
- Use AND/OR macros.
- Improve Makefile deps and use more general wasm target.
- Properly cleanup memory in try* and use TCO as part of try*.
- Convert sources to much more concise wam syntax supported by wamp.
- Rename sources from *.wast to *.wam and generate *.wast files by
translating via wamp.
