parse: Move peek back to after next

parse: Detect and skip shebang

parse: Put filename at end of traceback instead of start position

parse: Make parse_file handle the file

parse: Don't lowercase keywords

parse: Improve some parser error messages

parse: Better error messages for set statements

parse: Better error messages for statements

parse: Better error messages for statement arguments

parse: Clarify version handling error message

parse: Fix line columns for set/if statements

parse: Initial line errors in error output

parse: Create parser errors indirectly

parse: Add line numbers and columns to tokens

parse: Track file position when reading symbols

parse: Update logging in tokenize

parse: Simplify tokenize logic

parse: Fix use of log.LEXER instead of log.TRACE

parse: Use read_text to read text

parse: Add skip_note function

parse: Simplify nested if statement

parse: Skip whitespace when reading tokens

parse: Put token reading in read_token

parse: Use stateful next function for Tokenizer

parse: Move tokenize to a class

parse: Refactor trace logging output

parse: Clean up log messages a bit

parse: Remove redundant 'parsing directive' context

parse: Use exceptions in parse_value

parse: Use exceptions in parse_arguments