NXV11 python code test

Did some test with Xevel's code. Fix some display issues and make plot more easy to read.
Here is the list of improment

1. Fix view point make lidar scan display correctly.
2. Add ring every meter make it easy to read distance
3. Enable the 0 degree heading line.
4. Moving label,text so we can have clear view of the scan.
   

Here is the link to github (fork from NXV11).