convert bignum library; adapt serialVFD, CFontzPacket, IOWarrior

docs/lcdproc-dev/driver-api.docbook

@@ -132,7 +132,7 @@ API_VERSION in the code.
 	// - It is currently unclear how this system should work exactly
 	// - The set_char function expects a simple block of data with 1 byte for each pixel-line.
 	//   (So that is 8 bytes for a 5x8 char)
-	void (*set_char)	(Driver *drvthis, char ch, char *dat);
+	void (*set_char)	(Driver *drvthis, char ch, unsigned char *dat);
 	int (*get_free_chars)	(Driver *drvthis);
 
 	// get width / height of a character cell (in pixels)
@@ -473,10 +473,12 @@ typedef struct my_driver_private {
 	<funcdef>void <function>(*set_char)</function></funcdef>
 	<paramdef>Driver *<parameter>drvthis</parameter></paramdef>
 	<paramdef>char <parameter>ch</parameter></paramdef>
-	<paramdef>char *<parameter>dat</parameter></paramdef>
+	<paramdef>unsigned char *<parameter>dat</parameter></paramdef>
   </funcprototype>
 </funcsynopsis>
 <para>
+The set_char function expects a simple block of data with 1 byte for each pixel-line.
+(So that is 8 bytes for a 5x8 char)
 </para>
 
 <funcsynopsis>