adierking / unplug / 25659262963

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asm: Support user-defined constants

Allow users to declare custom constants using `NAME = VALUE` lines.

This is something I've been wanting for a while, and it's crucial for making
code easier to read. It slots pretty nicely into the AST-to-program step so that
constants are resolved before most other things are processed.

Once we support include files, Unplug can generate a script file with a bunch of
built-in constant declarations that get imported into every other script file.

This really needs unit tests, but seems to work OK from a bunch of things I've
tried.

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