Wire Toolscreen

Continuing #338 

Rather than quickly scrolling the name of the tool, I'm using a variable fontsize.
Instead of `#tool.mode.name`, I'm using the `TOOL.Name` (which is the name displayed in the tool list), so:
"Thruster Tool (Wire)" -> "Thruster", with the Wiremod logo persistent at the top.
It shows the spawnicon of the current model to be spawned.

It contains small indicators for the new global convars Weld to World and Nocollide All, and also help point out that holding alt disables all welding.

Any other suggestions?


[Vanilla](http://imgur.com/3PdzQTL), [Commit 1](http://imgur.com/AQqUXql), [Current](http://imgur.com/zUGO4Ap)