WIP web input validation

[mcspr]

Just an example 🏎

Instead of alert, report input errors in-place with nice hint highlight (it already says what can be wrong!)

• Hostname and password regexps moved to input.pattern attribute
• Check input when typing
• Report errors using hint coloring + reportValidity
• Highlight input origin panel in the menu when invalid

Edit: little example about validity thing for inputs: https://googlechrome.github.io/samples/report-validity/ (Yes, it does look really strange on android with Firefox) Edit2: travis broke on npm package fetch :/