Better inline task editing with keyboard

[szpak]

Is your feature request related to a problem? Please describe. Together with some other keyboard-related enhancements it would be good to improve an ability to edit the current task just with keyboard. It is currently possible to run through (some of) fields (e.g. star or is completed) using TAB and edit it with ENTER, however it doesn't work for text fields and dates (among others).

Describe the solution you'd like Pressing ENTER (and/or F2?) on the TITLE field should activate the inline edit mode the same as a double click (it should be accepted with ENTER - as it's working now).

Describe alternatives you've considered As dates can be already edited using keyboard, it would be good to allow also to activate an EDIT mode by pressing ENTER for date fields (as it already works for dates in the task edition dialog).