Implement more options + Add depth dimension (revert DimensionLayer) (#37)

- Displayed text
- Enable Shortcuts
- Hide text
- Disable Dimension
- Depth dimension

Reviewed-on: https://git.siklos-chaneru.duckdns.org/Siklos/svg-layout-designer-react/pulls/37

src/Interfaces/IProperties.ts

@@ -11,6 +11,9 @@ export default interface IProperties {
   /** id of the parent container (null when there is no parent) */
   parentId: string | null
 
+  /** Text displayed in the container */
+  displayedText: string
+
   /** horizontal offset */
   x: number