XLiCap Reticule file format

- All files are plain text.
- Lines beginning with a hash (#) are comments and are ignored.
- All positions and sizes are in percentage of image height.
  For a normal 4:3 aspect ratio camera this means the visible width
  extends from roughly -16.6 to 116.6 percent.
- The center of the image is (50,50)
- All values are floating point

- Available instructions are:

LINE X1 Y1 X2 Y2
CIRCLE X Y W H
RECT X Y W H
TEXT X Y SIZE "Comment"
