Basic support for snapping to multiple zones (#1955)

* Refactor a method which resizes windows

* Completed initial work for MultiZones

Without changing any test, they all pass!

* Implemented a basic version of Multizones, updated some tests

* Reduced the sensitivity radius

* Added a few must-have unit tests for Multizones

* Some fixups

* Took care of the conflict between this and #1938

* Improved how zones are detected, reverted a change in one unit test

* Resolved another merge conflict

* Fixed bugs related to stamping

src/modules/fancyzones/lib/ZoneWindow.h

@@ -53,6 +53,13 @@ interface __declspec(uuid("{7F017528-8110-4FB3-BE41-F472969C2560}")) IZoneWindow
      * @param   index  Zone index within zone layout.
      */
     IFACEMETHOD_(void, MoveWindowIntoZoneByIndex)(HWND window, int index) = 0;
+    /**
+     * Assign window to the zones based on the set of zone indices inside zone layout.
+     *
+     * @param   window   Handle of window which should be assigned to zone.
+     * @param   indexSet The set of zone indices within zone layout.
+     */
+    IFACEMETHOD_(void, MoveWindowIntoZoneByIndexSet)(HWND window, const std::vector<int>& indexSet) = 0;
     /**
      * Assign window to the zone based on direction (using WIN + LEFT/RIGHT arrow).
      *