Remove old color space configs from tools

This centralizes the new color-space parsing into SkCommandLineConfig,
and then wires that up in DM, nanobench, and skpbench. It also removes
all of the old config names that encoded both color type and space.

Change-Id: I9a63a97f1d153e7636a1fb974cc4071f5ada3184
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/438377
Reviewed-by: Brian Salomon <bsalomon@google.com>
Commit-Queue: Brian Osman <brianosman@google.com>
7 files changed