Implement minWidth property + refactor default property of new containers and main container (#34)

Co-authored-by: Eric NGUYEN <enguyen@techform.fr>
Reviewed-on: https://git.siklos-chaneru.duckdns.org/Siklos/svg-layout-designer-react/pulls/34

src/Interfaces/IAvailableContainer.ts

@@ -5,13 +5,14 @@ import { XPositionReference } from '../Enums/XPositionReference';
 /** Model of available container used in application configuration */
 export interface IAvailableContainer {
   Type: string
-  Width?: number
-  Height?: number
   DefaultX?: number
   DefaultY?: number
+  Width?: number
+  Height?: number
+  MinWidth?: number
   AddMethod?: AddMethod
   XPositionReference?: XPositionReference
   CustomSVG?: string
-  Style: React.CSSProperties
+  Style?: React.CSSProperties
   UserData?: object
 }