Fix simple mouse plugin

[StraToN]

Full revamp of the UI.
Still not the best, having to mousewheel through actions is not the best.

[BHSDuncan]

Question: If I mousewheel to, say, the "look" action (the eye), and I mouse over the button in room 2, the action automatically changes to what I'm assuming is the default action for that button, in this case, the "use" action (the wrench). Is this on purpose?

Also, if I hover over the inventory while I'm in windowed mode, and I move the mouse off the edge of the game window (while still over the inventory panel), the inventory panel is stuck in the raised position until I mouse back over and move the mouse off of the panel to a non-inventory panel area of the game window.

[BHSDuncan]

The actions behave better now. Nice!

The "hover over inventory" issue I mentioned in my previous comment still exists, though. Can it be fixed?

One other thing I've noticed (likely unrelated to the simple mouse fixes you're doing): esc_game.gd lines 58, 59, and 60 produce an error when trying to connect three signals that are already connected to their respective handlers. This happens when starting a new game (i.e. using F5 to start and selecting "New Game").

[StraToN]

@BHSDuncan I forgot your comment regarding inventory close. Fixed.
I also fixed the cursor not getting back to "walk" icon when unhovering inventory item.

[BHSDuncan]

@StraToN If I run room 1 directly (F6), I get a crash on startup: esc_item.gd#L637. Screenshot below:

[StraToN]

Strange. Ok I'll check this tonight. Thanks!
edit: should be fixed now.