Add indentation checker to our run-lint script
Add indentation checker to our run-lint script

Added an indentation checker to our cpplint code checker. It now will
make sure lines are indented with 0 or more tabs followed by 0-3 spaces.
We will allow up to 3 spaces for aligning lines. Anymore than 3, and a
tab is expected.

simquest/opensurgsim,simquest/opensurgsim,simquest/opensurgsim,simquest/opensurgsim