Disable colored output for non-interactive terminals

[rhuitl]

Disables colored output for non-interactive terminals. PCL_CLICOLOR_FORCE or pcl::console::enableColoredOutput() can be used to override this behavior.

Fixes #3308.

[taketwo]

I think it'll compile on Linux and Windows but not sure how to check - do you have a build server to test that?

We do have CI, however there are no unit tests for console printing functions. Nevertheless, we can see that it works on Ubuntu. If you open the "Run Unit Tests" step in the last master branch build, you will see colored output here and there. In this PR build, however, there are no colors. Unfortunately, we can not perform the same check for Windows since unit tests are not currently running for that platform. But the build succeeded at least.

[rhuitl]

Thanks @taketwo! Can we merge this or do we need more reviewers? I don't have write access so I cannot merge.

[taketwo]

We usually try to follow the rule of two reviews per PR. @SergioRAgostinho do you have time to have a look?

If we don't hear back in a couple of days, I'll merge.