Multiple bug fixes

[kshitijalwadhi]

• Updating user data in current Group when the user changes his details from profile page.
• Add validator to check Start Time < End time while creating group and also while editing.
• Added Snackbar for errors and Progress Dialog in Sign up and Register Screens.
• Fixed cards UI in dashboard.
• Added option to edit privacy setting in edit group page.
• Fixed deleting user from chatroom logic (now doesn't remove the user from chatroom if the ride has ended).
• Showing only chatrooms of last 30 days in messages screen.
• Fixed overflow in Notifications screen. Row -> Wrap
• Set character limit to 50 in chat screen as well as number of documents fetched to 30.
• Added a dummy help page.
• Removed scroll physics from Requests page

[kshitijalwadhi]

Updated layout of cards on dashboard (Removed join now and added icon for open groups)

Added option to change privacy of group in edit group section

[tmibvishal]

Fix the conflicts

[kshitijalwadhi]

Fixed