Added new ticker program, which shows a rotating

text. Text can changed by sending a text (terminated
with newline) to RX pin.

Added 'const' to font data in font.h to allow it
to be stored as program data.

Author: FransFaase

software/cp437/font.h

@@ -5,7 +5,7 @@
 #endif
 
 
-byte cp437_font [256] [8] PROGMEM = {
+const byte cp437_font [256] [8] PROGMEM = {
   { 
     0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00     }
   , // 0x00