Fix deprecated 'prog_*' typedef - Issue #34

- Remove prog_char from xpritnf
- Remove prog_macro_t from acton_macro

avr-libc-1.8 removed 'prog_*' typedef because the usage of
the __progmem__ attribute on a type is not supported in GCC.
http://www.nongnu.org/avr-libc/changes-1.8.html

common/action_macro.c

@@ -28,7 +28,7 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 #ifndef NO_ACTION_MACRO
 
 #define MACRO_READ()  (macro = pgm_read_byte(macro_p++))
-void action_macro_play(const prog_macro_t *macro_p)
+void action_macro_play(const macro_t *macro_p)
 {
     macro_t macro = END;
     uint8_t interval = 0;