starting to implement first macros

Another commit, another bugfix.

Some snippets from my currently exploding todo list:

- always investigate lookup errors immediately. Beyond the root cause, they should never happen at the moment, while we aren't reclaiming memory.
  we should always return a more precise error message. Usually involving null pointer checks.

- on abort, print out stack trace
  - emit mapping of labels to addresses during survey
  - store a mapping of symbols somewhere in the code image

- stop allocating 1KB per token; expand space for tokens as needed

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