Add support for new keywords introduced with the new 'blueprints'

[jmgiaever]

Hi,

With the new version on HA (2020.12.0) there's introduced new keywords with the new integration blueprints. One of them that I know of is !input.

[martinw72]

yes, would be great! I'm using Editor to adapt blueprints and make new once, but can't check them for real issues if the !input is not reconized right!