tests: Fix typo in test_note

tests: Refactor test_text to use template_test_*

tests: Refactor test_clear_notes to use template_test_*

tests: Refactor test_note to use template_test_*

tests: Refactor test_bool to use template_test_*

tests: Expect arrays for messages instead of dicts

parse: Drop enum class in favor of DIY method ...

This is slightly sketchy but should be enough to get MicroPython working
with the new parser.

tests: Minor whitespace fix

parse: Create messages from ParseTasks

parse: Add filename to error messages

parse: Create messages from ParseErrors

parse: Rename ParseError messages to ParserError

tests: Tidy parse error test data

parse: Add function to fully format an error

tests: Always draw a task for ParseContext

parse: Add function to format a ParseContext for display

parse: Add function to format a ParseErrorException for display

tests: Document parse error data structures

tests: Fix draw_maybe ratio ...

I wrote this code while really tired and of course an off by one error
slipped in.

tests: Use a proper values for structural ParseContext tests

src: Check for None in all __eq__ methods ...

This lets us finally compare parse error exceptions and contexts of
different shapes.

i18n: Add new module containing a Message class ...

This Message class will be used to format localized text later.

tests: Move parser error tests to its own file

parse: Have parse run parse_file

parse: Add file parser

parse: Add directive parser

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