Revert "Bug 574170 - Add coloring to the stack frames of the debug thread view"

This reverts commit c2dd7af8f0c9161182a157e0768d5bb5feed5c77.

Reason for revert: Needs fine tuning and to be released in 4.22

Change-Id: Ia97978b0abcd3341180d1a13581803ad0df83151
Reviewed-on: https://git.eclipse.org/r/c/jdt/eclipse.jdt.debug/+/183773
Tested-by: Sarika Sinha <sarika.sinha@in.ibm.com>
Reviewed-by: Sarika Sinha <sarika.sinha@in.ibm.com>
19 files changed