tests: Move notes to lexer soup

tests: Remove unused draw_token_reserved

tests: Remove conjoined tokens ...

These aren't tokens, these are just different named symbols I think.

tests: Generate a lexer token soup ...

At the moment this doesn't include location information, but this is a
good first step.

tests: Make test_lexer_token test conjoined tokens

tests: Generate conjoined tokens from symbols too

tests: Add True and False to reserved_words

parse: Strip whitespace in text tokens

parse: Replace 'Begin' with 'Start' in keywords ...

Okay, it's to the point I'm writing bugs in tests due to this.
Just change it already.

tests: Rename 'text_tokens' to 'note_tokens'

tests: Wrap tokenizer to catch parse errors

tests: Re-order parser tests

tests: Refactor parser token generation to use strategies

tests: Move utility functions to top of test_parse file

tests: Add whitespace variable for lexer tests

tests: Test tokenizer with empty string

tests: Test that conjoined keywords are parsed as symbols

tests: Make sure text and note tokens aren't accidently nested

tests: Exclude reserved words and shebangs from lexer tests

tests: Fuzz whitespace for text and notes

tests: Test location in lexer texts

tests: Add lexer test for shebangs

tests: Add lexer test for symbols

tests: Add lexer test for keywords

tests: Add test for lexing booleans

tests: Test parser note mechanism

tests: Test text parsing with the lexer

tests: Comment test_parser_fuzz

parse: Decode file as UTF-8 ...

I was testing the parser with binary input.
Use Unicode instead and make sure we pass it that.

Add test harness and simple fuzz test