Additional Widths for Freestanding Walls

We already have standard freestanding wall objects (under structural) but they all assume a 5ft width at normal height. Changing the width also changes the height (= not ideal). This can be alleviated by having freestanding wall sections that are 1.43 and 1.75 normal width (the equivalent of 7.15 ft and 8.75 ft. This allows for diagonal walls over different "pitches". (1 x 1) = 45 degree = 1.43. (1 x 2) = 26.6 degrees = 1.75. (1 x 3) = 18.43 degrees = 1.43 + 1.75, etc. This will also permit circular wall placement without fudging heights. Easy enough to implement by stretching the existing object in the code. This way all walls are the same height regardless of width. The 2% overhang error margin will allow for any approximation errors. (e.g. (1.43 + 1.75)² = 10.1124, which is approximately the 10 you'd want for a (1 x 3) "pitch" - just overlap a little to get the 3.16 length you need (square-root of 10).