Changes

Summary

1. removing dependency with Shout (details)
2. using environment instead Smalltalk global (details)

Commit 198c4ff6023d2689d6519781c3b05a65f521c9ac by estebanlm removing dependency with Shout Fixes #2261
	src/Polymorph-Widgets/UITheme.class.st (diff)
	src/Polymorph-Widgets/PharoDarkTheme.class.st (diff)
Commit 7c51312269a8af82af189052afee90edc8bb1d5e by github using environment instead Smalltalk global
	src/Polymorph-Widgets/UITheme.class.st (diff)