Form, use new inputs
Form inputs v4, validation only

* Form inputs no longer care about rendering
Offcom, HEAD request method
Template renderer, propagate head proxy url
Class autoload does not throw
Basic input types v4
Proxy route
Proxy HEAD module
Datetime input support
Form, convert datetimes to std string
Multi select validations
Form renderer, temporary solution

* Dropped HTML rendering code
Dropped deprecated code
Update default form styles
Form locales
Offcom, rq, response

* Offcom request does not separate headers
* Offcom response parses headers
Form, clear null values
Input, empty value is null
File class, tweaks

* Moving file to temp changes its' name
* Downloading file grabs attributes correctly
File input