Moved Distance mouse mode to EPD Common
Created common RulerLayer
EPD ship is now using the common ruler layer
Distance circle implemented in EPD shore, but last drawn circle is hanging.
EPD-36 Created common Distance circle mouse mode for EPD shore.
Removed unused variables and imports
Fixed checkstyle too
EPD-36 Changed mouse checks to use SwingUtilities.
Merge branch 'master' of https://github.com/dma-enav/EPD into shore_migrate_rangemarker