tests: Fix draw_wrong_statement_at drawing invalid values

tests: Note what we expect for test_parse_set_valid

tests: Copy tokens in template_test_invalid ...

This makes debugging easier as our input data isn't consumed.

parse: Add conditional statement parser

parse: Add Set node parse code ...

I've taken a different approach this time with my tests by avoiding
decorated functions where I can and adding big upfront documentation
about how things work.

I've deprecated the old decorated functions and hopefully will remove
them during a refactor and cleanup.

parse: Add statement parsing

tests: Document expected parse task

tests: Test parse_value error propagation

parse: Add code for parsing values

tests: parse: Clarify what error_on_token does

tests: parse: Use a mock class for note skipping

tests: Use a static parse context for tests

tests: Use a static token location for random tokens

tests: Use static tokens with static locattions

tests: Use static token location for tokenizer test

tests: Fix test reference invalid name

tests: Fix test_tokenize not testing whitespace ...

This relied on draw_token_random which now doesn't include whitespace

tests: Document parse error exception codes

parse: Reserve keywords for reference names

tests: Move whitespace code to test_tokenize ...

The parser doesn't have to worry about whitespace, so it's not worth
worrying about it here.

parse: Parse a reference node

tests: Add garbled strategy for draw_token_random

src: Rename syntax to token

parse: Remove SyntaxType ...

Once again I find myself in the pattern of having a useless 'type' value
that just complicates my life. In this case the correct appproach is to
output the AST directly.

parse: Parse text and bools to AST types

parse: Check types when clearing notes, add extra tests

syntax: Refactor draw_syntax_random and add draw_syntax_texttoken ...

I realized draw_syntax_classified is the same as draw_syntax_random, so
just merge them.

Also add draw_syntax_texttoken explicitly meant to weed out cases where
token type is not set.

tests: Clean up syntax and parse code

tests: Clarify function documentation

tests: Tweaks to health checks and examples ...

The time-based health checks keep causing transient test failures,
especially when my host system is under load. Throw them away.

Also drop the max examples for long down. CI is already taking an hour,
so I assume long is going to take days.