This enhancement builds on from#7. The currentclear action will empty the undo/redo stacks and set the state of the store when theemptyState mutation is committed. Thenewreset action should empty the undo/redo stacks, but still maintain the state of the store up to this particular point.

IS

• given done:[mutationA, mutationB], undone:[mutationC], state:emptyState + mutationA, mutationB
• whenclear() is dispatched
• then done:[], undone:[], state:emptyState

SHOULD

• given done:[mutationA, mutationB], undone:[mutationC], state:emptyState + mutationA, mutationB
• whenreset() is dispatched
• then done:[], undone:[], state:emptyState + mutationA, mutationB