Feat/extend shortcuts for addtaskdialog

[Neeraj-gagat]

Description

added shortcuts for addtaskdialog
now user can navigate and chose feilds to edit by arrow keys
did little chnages in ui of addtaskdialog to show highlighted/focused feild

- Fixes: #319

video after chnages

Screencast.from.15-01-26.11.07.43.PM.IST.webm

note: let me know if this is good to go then i will add tests for shortcuts

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[its-me-abhishek]

There also seems to be a visual bug, the Add in Add task is hazy. Needs to be fixed.
Overall PR looks Good, do fix these, and also maybe reduce height of the fields by a bit, so as to fit in more content. Will merge later

[its-me-abhishek]

kindly rename fields and add_fields to better variable names.

[its-me-abhishek]

do remove these comments