- updated MainToolbar component:  * added toggle for "persistent" design  * added button to create new designs/reset  * added stubs for most of the future features  * slight tweaks and cleanups
- updated MainToolbar component:
 * added toggle for "persistent" design
 * added button to create new designs/reset
 * added stubs for most of the future features
 * slight tweaks and cleanups

usco/Jam,usco/Jam