Update FormHandler for Typo3 v11

[tlueder]

Hi,

This is still a work in progress but I would like to get feedback as early as possible and also this patch is already a big one.

System setup:

• php 8.0
• Typo3 v11.5.3
• debug mode on
• error level 12290

What have I done:

• Updates dev dependencies in composer.json
• set strict_types = 1 in all files
• Added debug var_dump in case an exception was thrown (need to be removed later)
• added types to all functions and classes (where possible)
• Fixed all type errors (hopefully)
• Replaced swiftmailer dependency with symfony/mailer
• Rewrite of the TCA facing code PredefinedForm, PredefinedJs and SubmittedValues (needs more love)
• Added is set checks
• removed dead code

Whats new:

• templateFile can now handle template arrays to split the form and mail templates into separate files
• resolvePath can now also resolve paths stating with typo3conf

What works:

• Load extension in Typo3 v11 in debug mode without errors
• Load predefined forms
• Render form
• Validate form (see list of tested Validators)
• Finish form process (see list of tested Finishers)
• Send mails :)

Tested Validators:

• Integer
• Email
• MaxLength
• MinLength
• Required

Tested Finishers:

• Mail
• Redirect
• SubmittedOK

Todo:

• Add more type hint for every makeInstance to make debug easier
• Add more type castings and checks
• Rewrite all broken deprecated code (high priority)
• Rewrite all deprecated code (low priority)
• Rewrite of the backend modul (low priority)
• Rewrite of backend js like addFields_predefinedJS (medium priority)
• Testing, testing, testing
• Remove of debug var_dump

Any help and input is much appreciated.

Also this can be broken up into separate pull requests if needed.

Thanks

[pulponair]

@tlueder Thanks for the huge amount of work you put into this that is awesome!. Would you mind splitting this PR into smaller chunks each addressing its own issue?. E.g. If you would outsource the "Remove swiftmailer" - part (4aedaf9) in a seperate PR that would be probably merged right away. //cc @7elix

[tlueder]

Hi @pulponair , sure thing.

I'll prepare smaller PRs and group them by bug fix, clean up, new feature and so on.
This big PR was meant as a look at this and tell me what you think about it.

Another question is about the typing. In this state formhandler needs php 8.0 would that be ok?
Typo3 11 has a min php version of 7.4

[pulponair]

@tlueder
Minimum php version should play along with the TYPO3 11 requirements. So php7.4 :)