Inventory, Fixed Movement During Dialogue

The journal now has an inventory of CaseObjects.  When you click on a
CaseObject, it adds it to your inventory and then disappears from the
game space.  The player will no longer move during dialogue/r.  It also
prevents the player from moving when closing the last set of text.
Placeholder mouse icon for Pick Up/Grab added.
Merge pull request #71 from Kiroshima/master

Inventory, Fixed Movement During Dialogue