Merged PR 17: Implement rigid body Fix multiple bugs

Implement rigid body

Fix saveload bug: having null elements
Fix events being duplicated and not being removed

src/Interfaces/HistoryState.ts

@@ -1,6 +1,7 @@
 import { IContainerModel } from './ContainerModel';
 
 export interface HistoryState {
+  LastAction: string
   MainContainer: IContainerModel
   SelectedContainer: IContainerModel | null
   SelectedContainerId: string

src/Interfaces/Properties.ts

@@ -5,4 +5,5 @@ export default interface Properties extends React.CSSProperties {
   parentId: string | null
   x: number
   y: number
+  isRigidBody: boolean
 }

src/Interfaces/SizePointer.ts

@@ -0,0 +1,4 @@
+export interface SizePointer {
+  x: number
+  width: number
+}