Make ClySystemEnvironments responsible for managing environment elements in ClyScopes

[carolahp]

ClyScopes have an environment but currently they don't use it to get packages, classes, and methods from the environment. Instead, they ask directly to the elements for their related elements, for example, they ask a RPackages for their classes.

This PR proposes a refactor to make ClyScopes ask for environment elements to its own environment.

This change will make it possible to browse RBEnvironment elements in calypso (This feature is implemented in this NewTools PR)

[jecisc]

Tests are failing. For example:

receiver of "system" is nil
Stacktrace
MessageNotUnderstood
receiver of "system" is nil
UndefinedObject(Object)>>doesNotUnderstand: #system
[ :eachClass |
		(environment system methodsInClass: eachClass) do: aBlock ] in ClyTraitUserScope(ClyClassHierarchyScope)>>methodsDo:
ClyClassScope class>>metaLevelsOf:do:
ClyTraitUserScope(ClyClassHierarchyScope)>>metaLevelsOf:do:
[:each |
		((localScopeClass metaLevelForHierarchyOf: each) = each) ifTrue: [
			each isObsolete ifFalse: [ self metaLevelsOf: each do: aBlock].
			self allClassesRelatedTo: each do: aBlock]] in ClyTraitUserScope(ClyClassHierarchyScope)>>allClassesRelatedTo:do:
IdentitySet(Set)>>do:
ClyTraitUserScope class>>classesRelatedTo:do:

[carolahp]

No needed anymore