[GEOT-4949]: Adding ImageUtilities and ColorUtilities constant and methods
[GEOT-4948]: Adding DrawableBitSet
Merge pull request #621 from dromagnoli/GEOT-4949-11.x

[GEOT-4949]: Adding ImageUtilities and ColorUtilities ... - backport to 11.x
Merge pull request #622 from dromagnoli/GEOT-4948-11.x

[GEOT-4948]: Adding DrawableBitSet - backport to 11.x
[GEOT-4947]: Adding DisposeStopper wrapper