Split canvas into sections

Split up the entire canvas into a "New Animal" section on the left, and
a "Working Animals" section on the right. Also disabled selection of
text on objects.
Made the Working Area droppable

Made the working area a droppable, and set the new animal object to
become a working object when dropped into the working area div.
New Object replicates when dropped

When the New Object is dropped into the working area, a New Object is
generated in the emptyAnimalBin area
Fixed replication bug

Fixed bug where moving and dropping a workingAnimal object in the
workingArea div would cause a new object to be generated.