Clean room.js code

[yuri-karadzhov]

Make the file /assets/javascript/room.js more readable

• Add indentation
• Correct conditional operators (switch, case instead of else if)
• Create auxiliary variables (var selTool = opts.selectedTool; and so on)
• Move auxiliary functions to the separate file
• Structure it better now - it's a mess

[dmitry-solomadin]

Done.