Refactoring SchemaCollection to allow any kind of schema + internal c…

…ode simplification (#81)

* refactor schema, tags and internal logic

* fix tag attributes order

* update readme and remove FAQPage

* fix readme

* fix readme

* remove useless code

* install pint and format

* WIP keep using fluent methods now based on CustomSchema class

* Fix tests

* Style

* Update README.md

* Update README.md

* Update README.md

* Rename

* Update CustomSchemaFluent.php

* WIP

* Delete test-results

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Co-authored-by: Ralph J. Smit <[email protected]>