Update and use Validation class

Fix: #4221 - add validation for Seznam robots

Create Timestamp class and factory to replace direct-dependency on Carbon

Fix: #1663 - add support for ANSEL encoding

FLoC has risen from the dead under a new name.

Remove PHPDebugBar - not compatible with PHP8 and not being updated

Google have abandoned FLoC - no longer need to opt out

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CodeStyle

CodeStyle - whitespace

Remove unused imports

PHPdoc

Refactor HTTP exceptions

CodeStyle

Remove deprecated functions

Update calls to deprecated functions

Update dependencies

Split compress-response / content-length middleware into two

Working on #3571

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Prefer https for links to documentation

CodeStyle