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.

server/drivers/ula200.c

@@ -33,10 +33,10 @@
 #include <usb.h>
 #include <ftdi.h>
 
-#include "hd44780-charmap.h"
 #include "lcd.h"
 #include "ula200.h"
 #include "report.h"
+#include "hd44780-charmap.h"
 #include "adv_bignum.h"
 
 
@@ -880,10 +880,10 @@ ula200_icon(Driver *drvthis, int x, int y, int icon)
 		ula200_chr(drvthis, x, y, 4);
 		break;
 	    case ICON_ARROW_LEFT:
-		ula200_chr(drvthis, x, y, 0x7F);
+		ula200_chr(drvthis, x, y, 0x1B);
 		break;
 	    case ICON_ARROW_RIGHT:
-		ula200_chr(drvthis, x, y, 0x7E);
+		ula200_chr(drvthis, x, y, 0x1A);
 		break;
 	    case ICON_CHECKBOX_OFF:
 		ula200_chr(drvthis, x, y, 5);