Added --force-color flag to catkin_make and catkin_make_isolated

[stertingen]

This can be used to enforce colored output even on non-interactive output. --force-color can still be overriden by --no-color.

This PR is for CI environments where the output is stored in a file but a colored output makes it easier for a user to read the log.

[stertingen]

There are some alternatives to the current implementation:

• --force-color overrides --no-color
• Error/Warning if --force-color and --no-color are both set