Convert range circle rendering to world coords.
Convert terrain rendering to world coords.
Convert Altitude to world coords.

Removes the obsolete AltitudeInit: use CenterPositionInit instead.
Convert Health Radius to world coordinates.
Implement IComparable on WRange.
Convert weapons to world coords.
Move CPos and CVec into FileFormats.
Add FieldLoader support for CPos and CVec.
Convert Exit to world coordinates.
Convert actor speed to world coordinates.
Introduce a mod/map upgrade tool.
Upgrade mod rules to match engine changes.
Update changelog.
Merge pull request #4371 from pchote/more-world-coords

Convert remaining yaml definitions to world coordinates