Added a universal Wire toolscreen
Rather than quickly scrolling the name of the tool, trying using various sizes
#338
Added convars wire_tool_worldweld and wire_tool_nocollide
These replace the checkboxes in individual tools.
They can be set in "Wire - Tools" -> "Tool Options"
Welding can be disabled by holding Alt while spawning.
Added these convars to the Tool Screen
#370
Toolscreen: Added spawnicon
More because its cute than for practicality
Removed a few more refs to tool's collision checkboxes
Closes #431