Stun baton and camera fixes

#### Stun baton
* Fixed stun baton sometimes not updating its icon when out of charge
* Fixed stun baton sometimes having 1 more or 1 less charge than its power cell has

#### Camera
* Made camera not take a picture when placed on a table/rack or in a container
* Made camera light go red if there is no film in the camera
* Moved camera pictures_left description to the examine verb