Merged PR 175: Implement drag drop

- [x] Implement drag drop to create an element at a specific index
- Add Swap behavrior
- Implement max contraints with simplex
~~- [ ] Implement drag drop to swap two container that flex~~

- Fixes tries number for simplex it can now go up to 2 * number of containers
- Fixes flex calling another flex behavior when not needed (remember that flex behavior is the only behavior that needs to communicate with siblings)
- Fix max width being ignored in input group

src/Components/Editor/Editor.tsx

@@ -4,7 +4,7 @@ import { IConfiguration } from '../../Interfaces/IConfiguration';
 import { SVG } from '../SVG/SVG';
 import { IHistoryState } from '../../Interfaces/IHistoryState';
 import { UI } from '../UI/UI';
-import { SelectContainer, DeleteContainer, AddContainerToSelectedContainer, OnPropertyChange, AddContainers } from './Actions/ContainerOperations';
+import { SelectContainer, DeleteContainer, AddContainerToSelectedContainer, OnPropertyChange, AddContainer } from './Actions/ContainerOperations';
 import { SaveEditorAsJSON, SaveEditorAsSVG } from './Actions/Save';
 import { OnKey } from './Actions/Shortcuts';
 import { events as EVENTS } from '../../Events/EditorEvents';
@@ -240,6 +240,16 @@ export function Editor(props: IEditorProps): JSX.Element {
             setNewHistory(newHistory);
           }
         }}
+        addContainerAt={(index, type, parent) => setNewHistory(
+          AddContainer(
+            index,
+            type,
+            parent,
+            configuration,
+            history,
+            historyCurrentStep
+          )
+        )}
         addSymbol={(type) => setNewHistory(
           AddSymbol(
             type,