Utils: Start Environment/EnvironmentChange consolidation

The plan is now to keep 'Environment' as the concept name, but
have what is currently 'EnvironmentChange' as implementation,
as keeping a full env vs env change(set) distiction gets messy.

First step is to cut the direct dependency of EnvironmentChange
from a (current) Environment that causes circularity when moving
the implementation.

Change-Id: Id8b512b311071611b750b27af59549ce7c2ce8e6
Reviewed-by: Christian Kandeler <christian.kandeler@qt.io>

src/libs/utils/pathchooser.cpp

@@ -324,6 +324,11 @@ void PathChooser::setBaseDirectory(const FilePath &base)
     triggerChanged();
 }
 
+void PathChooser::setEnvironment(const Environment &env)
+{
+    setEnvironmentChange(EnvironmentChange::fromDictionary(env.toDictionary()));
+}
+
 FilePath PathChooser::baseDirectory() const
 {
     return d->m_baseDirectory;