Pyramid driver:

- Convert set_char to 8 byte bitmap.
- Reset ccmode on clear. Add a custom character cache to avoid unnecessary
  updates of custom characters because of the reset.
- Add support for bignum.
- Remove the FB_modified flag, it did never work. Instead add a backing store
  buffer to compare against. Remove the 40ms block of updates, this was a
  no-op as well. However, pause 40ms after sending a complete screen update.
  The display I have requires this to recognize the following cursor updates.
- Do not treat frame buffer as string. Always use memcpy, memcmp, and memset.
- Remove the changelog. This should be read from SCM.
- Remove contact info as T. Riewe has left Pyramid.
- Pass through indent, preserving 4 space indention.

ChangeLog

@@ -21,6 +21,7 @@ v.0.5dev (ongoing development)
  * Pyramid: Only send LED state changes, doxygen-ize
  * sed1520: Make it work with 68-family style interface, convert to 0.5 API
  * hd44780/imon: Add charmap for NEC uPD16314 and make it configurable
+ * Pyramid: Convert set_char to 8 byte bitmap, add support for bignum
 
 v0.5.4
  * Update driver includes and LDFLAGS (fixed glk and bayrad binding error)