[FEATURE] Add isBoolean ViewHelper
Merge pull request #688 from Akii/development

[FEATURE] Add isBoolean ViewHelper
[BUGFIX] Using useShortcutUid should return shortcut url
Merge pull request #689 from hmspl/useShortcutUid

[BUGFIX] Using useShortcutUid should return shortcut url
[TASK] Refactor and cover Condition / Context scope with tests
[TASK] Refactor and cover Iterator / Merge, Pop, Random, Shift