Implement all input types

[DasIch]

All input types should be implemented as elements, that can be used to create schemas. So far only a few of them are:

• [x] text (Text)
• [x] password (Password)
• [x] hidden (Hidden and Secret)
• [x] checkbox (Checkbox and MultipleChoice)
• [x] radio (Choice)

This leaves the following - excluding types that don't submit anything - missing:

Types supported by most browsers:

• [x] email (Email)
• [x] submit (Submit)
• [ ] file
• [ ] image
• [ ] tel
• [ ] search
• [ ] url

Types unsupported by most browsers:

• [ ] color
• [ ] date
• [ ] datetime
• [ ] datetime-local
• [ ] month
• [ ] number
• [ ] range
• [ ] time
• [ ] week

To discuss/implement any of these create a new issue/pull request and reference this issue, as this the purpose of this issue is merely to track progress.

Edit: Split up list of types in ones that are supported and unsupported by most browsers, as documented in the MDN

[DasIch]

submit has been implemented with Submit in 2248c14105f59e585dfb4159f6b167edf6ad547e

[DasIch]

email has been implemented with Email in 5d23835fcfe71fd720257b421d1ddfce4b098cda