50 cannot take gel boat out of electrolysis setup

[tylerhand1]

It is possible again to remove the gel boat, albeit the functionality to do so was adjusted to rely on a click within the setup instead of trying to drag out an invisible object.

It also fixes issue #95 that causes objects like the erlenmeyer flask to get stuck. It now automatically ejects these objects within the eletrolysis setup script.

There are a couple small issues that remain to be fixed:

• _on_Area2D_body_exited() is still being called occasionally even though the function was disconnected
• When taking the gel mold out, it opens the subscene for it

[tylerhand1]

Fixed issue with _on_Area2D_body_exited() being called and subscene opening.