Add *T measuring

[erikquinn]

Using two clicks, the heading and distance between two points should be calculable and displayed to the user to aid in vectoring. In the STARS system, this is accessed via [*T (click) (click)], and in ERAM it's the "RNG BRNG" button, and click click. Need to figure out which to emulate or how else to most easily expose this functionality to the user.

[erikquinn]

The ATC repository is being migrated to it's new home at https://github.com/openscope/openscope,
and thus, all issues are being closed. If this is still an issue with the latest version of the sim
(accessible at http://www.openscope.co), or is a feature you still think we are lacking,
please reopen the issue at the new repo.

Please note that the vast majority of these issues have been copied to the new repository, or else are covered by other issues created there. See the below screenshot for what it looks like when your issue is known in the new repo:

Thank you!

Closing this issue.