FS#10911 - Plugins: Fractals (formerly Mandelbrot)

- Rename the mandelbrot plugin to fractals
- Update manual accordingly
- Separate plugin's functionality into separate files
- Lay the ground for having fractals sets other than the Mandelbrot set.
  For that the following will need to be implemented:
  - Create a new file for the new fracral set
  - Provide key mapping to switch between sets


git-svn-id: svn://svn.rockbox.org/rockbox/trunk@24230 a1c6a512-1295-4272-9138-f99709370657

apps/plugins/fractals/SOURCES

@@ -0,0 +1,10 @@
+fractal.c
+fractal_rect.c
+mandelbrot_set.c
+#if CONFIG_CPU == SH7034
+cpu_sh7043.c
+#elif defined CPU_COLDFIRE
+cpu_coldfire.c
+#elif defined CPU_ARM
+cpu_arm.c
+#endif