1.639 Update - electric improvements and slot machines

- Added slot machines, plan your copy-paste casino for the next Rust update.

- Proximity check for walls has been fixed to allow wall stacking. Disabling proximity check is also a new option in placement options.

- Electrical code has been optimized regarding calculating usage, fixed some usage inaccuracies with certain circuits/devices in the process.

- Fixed a bug with placing foundations that would hide the part if mousing over another object while adjusting height.

- Smart alarms will now send a message.

- Counter placement on walls fixed.

- Clicking pressure pads is another option for testing now.

Edit: Linux users should no longer be getting the "missing executable" error message.

Borrowed this design for the screenshot:
https://steamcommunity.com/sharedfiles/filedetails/?id=2380200448