Many improvements to Banners4BM

[RealMuffinTime]

Hello,
here are some commits which intent to make this project more usable:

• Support for mutliple dimensions
• Non player block break is now recognised
• Add player notifications (configurable in config file)
  • When a player places a banner (to provide information how to add banners on the map)
  • When a player adds/removes markers via the map item
  • When a player breaks a banner (banner removed)
  • When a diffrent source breaks a banner (world broadcast)
  • Always provide a link to the bluemap
• Don't differentiate between filled and non filled map item
• Use standard config folder
• Add structured config files
• Improve README.md

Closes #2
Closes #3

-RealMuffinTime