427 Replace Moment.js with DayJS

[marksie1988]

Description

This change replaces the older Moment.js with the newer DayJS module.

• Improves loading speeds
• Size reduced from 401KB to 154KB (61.60% reduction)
• Fixes fireEvent which was causing build errors
• Added warning if entities are not found
• Adds default icon if one is not specified for calendar mode
• fixes bug where using same icon with different colour on multiple calendars would show only one icon

Related issues

closes #427 - Replace Moment with DayJS
closes #354 - Show summary for current day by default

Motivation and Context

• Performance improvements
• Move to a supported datetime module
• Reduction in size of the card

How has this been tested

Tests have been completed on my lab, however I cannot count for all scenario's so it is possible some bugs still exist as this is a major change to the codebase. Due to this, this release will be a major upgrade.

Types of changes

• Docs change / refactoring.
• Non-breaking change (fix or feature that wouldn't cause existing functionality to change/break).
• Breaking change (fix or feature that would cause existing functionality to change/break).

Checklist

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have performed a self-review of my own code.
• I have commented my code, particularly in hard-to-understand areas.
• I have made corresponding changes to the documentation.
• My changes don't generate new warnings.
• I have read the CONTRIBUTING document.
• I have added tests that prove my fix is effective or that my feature works.
• All new and existing tests pass.