Change icon handling and charmaps:

* The full block icon now has index 0 and the heart has index 7. This makes
  the full block work if vBar custom chars are loaded (which use index 1-7).
* Prevent (hbar, vbar, bignum) modes from overwriting custom chars (except
  full block).
* Prevent the heartbeat from overwriting custom chars in vbar and bignum mode.
* Make the driver point to 0x1A and 0x1B characters for right/left arrow
  characters (those are the codes from HD44780 A02) and make all charmaps
  pointing to the correct characters.
* It is now possible to map the tilde character.
* Update other drivers that use hd44780-charmap.h (IOWarrior and ula200).
* Replace characters using charmaps on input instead of output!
* Remove some unnecessary comments.

BUGS

@@ -4,7 +4,7 @@ Known Bugs:
 V0.5dev:
   - If vBars are used together with ICON_BLOCK_FILLED on the same screen and
     that icon is implemented as a custom char, it sometimes is replaced with
-    a non full block from the vBar.
+    a non full block from the vBar. Affected drivers: IOWarrior, CwLinux
   - On Solaris the mtc_s16209x driver fails to compile. Configure LCDproc to
     exclude this driver.
   - On FreeBSD drivers using the pthread library are known not to work.