Complete Rework

[Disane87]

Since my knowledge about angular raised a lot the last months, this projects needa a complete rework/regactoring. Some things are actually not good at the moment:

• Handling with data and the change detection
• Too much unmaintainable code
• Hard to debug template code (html)
• Peer deps to bootstrap

This rework will handle the points above and the current outstanding issues:

• Add ability to customize all icons #91
• Add an @Input to configure the field in which the user can search #72
• Emit native element when dropping an item #67
• Collapse columns #16
• Allow users to search and filter for specific keywords and group keys #15
• Split markup into chunks for better maintainability #13
• Add the ability to customize the placeholder while dragging #6