Modified the FibonacciNode and altered the scene and how the nodes are displayed. List of changes:
-Added accessors called "LineStart" and "LineEnd" to FibonacciNode so that the first LineRenderer component on the
node can positioned to draw a line between the node and its parent.
-Altered the "Left" and "Right" accessors so that when they are set, the LineEnd of the new child is set to the position
of this node (aka the child's parent).
-Added temporary references for the parent, leftChild, and rightChild within FibonacciTree's  function for readability.
-Tweaked the BuildTree function in FibonacciTree so that it builds in the -Y direction rather than in the -Z direction.
-Moved the camera in the Main scene so that it faces in the Z direction to look at the tree now.
-Tweaked the node prefab in the scene so that it displays its data towards the -Z direction again like it did originally.
Added a way to destroy a tree after it's created. Changes:
-Added DestroyTree function in FibonacciTree to destroy the tree if it has been created.
-Altered Start so that it tests DestroyTree too.
Some minor changes to the DestroyTree function in FibonacciTree:
-Added a delay parameter to the DestroyTree function in FibonacciTree so that the destruction of the actual nodes
for the tree is postponed by a specific amount of time.

Notes:
-When the DestroyTree function is called on a delay, the references to the nodes in FibonacciTree are removed IMMEDIATELY.
The instances of the prefab still exist in the scene until the delay is over, but the nodes will not be accessible through the FibonacciTree class!