Updated documentation.

Merge pull request #11 from smuuf/simpli

Simplified concept

Fixed stuff reported by PHPStan.

Merge pull request #7 from smuuf/arr

Better arrays + Native PHP functions

Merge pull request #6 from smuuf/pstl

Introducing Primi Standard Library

Use own smuuf/php-peg fork + Have updated Composer lock file.

+ Modified one error message in StringValue.

Fixed bug when echoing array value in REPL mode.

- Value objects now know how to represent themselves as strings in Primi syntax. (except functions)

Merge pull request #4 from smuuf/anonfunc

Anonymous functions

Strings can now be (properly) compared with numbers.

- "string" vs "number" no longer throws an error.
- It worked with comparing "number" vs "string" before, almost by accident.

Comments before EOL are now properly handled. (close #3)

- Comments are now handled by parser instead of using a naive regex which gets rid of them before it even went to the parser.