Shape screensaver

For RISC OS 4

Original program by Peter Young
Screensaver by Richard Coleman based on code from Foundation RISC USER

Added the following to the original code:
1. A display time in seconds, after which the display will clear and start again even if it hasn't reached the edge of the screen. Can have values from 0 (only restart when hit the edge of the screen) to 600 (10 minutes).
2. Can have a black background instead of different coloured backgrounds each time. Untick the Background option in the Screensaver settings window.

Install into !Boot.RO4Hook.Res.Configure.ScrSavers.
