- data from server now gets "streamed" dispatched by scan slice to
the client:
 * more efficient data structure with x,y,z,x,y,z array for positions
and r,g,b,r,g,b for colors
 * modified server and client side to be able to build models progressively
 * for now server side does not store full model at all
 * modified client to display data via buffergeometry (more efficient)

- fixed issues/improved turntable rotation code:
 * client now sends rotation in degrees
 * fixed rotation amount /steps code server side : 45 degree rotation is
ACTUALLY rotating by 45 degrees
 * code cleanup

- added auto removal of serial eventlisteners to avoid memory leaks

- modified client side display to use y up
- minor cleanup of ui markup
- added color (vertex color) toggler (not functional for now)
- minor adjustements to server side code:
 * small cleanups to loging
 * moved logging filtering to scanner module itself

- tinkering with parameters to bugfix weird pointclound "slice"
orientations