Idle City Update # 4 - Notifications, Calendar year, and Bug Fixes

Added the following:

- Instead of having a day number and a year, now it does days of the week, months, and year.

- Added notifications when peeple are missing work / home

- Added notification when tavern is available

- Added notification when buildings are unlocked

Updated the following:

- Build context buttons use icons instead of text.

Fixed the following:

- Grid outline was missing while in build mode

- Fixed font not showing in HTML5 version