
File format
-----------
Version 105

The file Options within an animation holds all the details of the
animation:

        Byte    Description
         0      File version number (105)
         1      Speed in centiseconds between frames
         2      Number of frames (maximum 768)
         3      Scale (%)
         4      Grid size (pixels)
         5+     Animation title

BUG: If more than 256 frames exist, the one byte allocated would not
be suitable to hold the number of frames.

If the version number is not equal to the current version number, then an
error should be produced. I will attempt to avoid changing the file version
number or if there is a very major change then I might provide backwards
compatibility.

A frame n is stored in Frames.n DIV 10.n. So frame 23 would be stored in
Frames.2.23.

All frames are simply LZW-compressed sprite files with one 150x150 mode 13
sprite named frame which is plotted with OS_SpriteOp 52.

Previous version numbers are:

Version
  100           Options stored in 0 file
  101           Renamed 0 to Options
  102           Added file version number
  103           Included grid size & scale
  104           Extended max. frames from 76 to 768
  105           Moved Options out of Frames

:-)
