lex.go: Remove item.String()
lex.go: Add itemSpace() and itemBlankLine()
lex.go: Change eof to EOF
lex.go: Move isSectionAdornment()
lex.go: Start line at 1 in lex()
lex.go: Add lexer.previous()
lex.go: Change lexer.ignore() to lexer.skip()
lex.go: Add lexer.advance()
lex.go: Rename isSpace() to isWhitespace()
lex.go: Refactor lexStart()
lex.go: Refactor lexSection()
lex.go: Add lexWhiteSpace()
lex.go: Add isSection()
lex_test.go: Use custom logger template
lex_test.go: Remove crappy comment support for parser