Squashed commit of Preparing for the montage undo-manager: Architecture changes

Reworked the add and remove elements into 1 function which can take 1 or more elements.
Removed the _element from the selection array
Many other changes related to those 2 changes
Undo/Redo shortcuts are now using montage undo/redo manager.

Signed-off-by: Valerio Virgillito <valerio@motorola.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/js/tools/modifier-tool-base.js b/js/tools/modifier-tool-base.js
index 94b806fd..46bb2e87 100755
--- a/js/tools/modifier-tool-base.js
+++ b/js/tools/modifier-tool-base.js
@@ -778,7 +778,7 @@ exports.ModifierToolBase = Montage.create(DrawingTool, {
                         {
                                 if(len === 1)
                                 {
-                                        this.target = this.application.ninja.selectedElements[0]._element;
+                                        this.target = this.application.ninja.selectedElements[0];
                                         drawUtils.addElement(this.target);
                                 }
                                 else