Added #define HI_TEXT (#119)

Added #define HI_TEXT to make the start-up hard-coded "HI" message configurable (with, for example, the user call-sign).

Co-authored-by: cda <newsletters@christophedavid.org>
Co-authored-by: Anthony Good <anthony.good@gmail.com>

k3ng_keyer/keyer.h

@@ -29,6 +29,8 @@
 #define SENDING_DIT 1
 #define SENDING_DAH 2
 
+#define HI_TEXT "HI"  // UPPPER case
+
 #define SPEED_NORMAL 0
 #define SPEED_QRSS 1
 
@@ -44,15 +46,15 @@
 #define SERIAL_WINKEY_EMULATION 1
 
 #define SERIAL_SEND_BUFFER_SPECIAL_START 13
-#define SERIAL_SEND_BUFFER_WPM_CHANGE 14        
-#define SERIAL_SEND_BUFFER_PTT_ON 15            
-#define SERIAL_SEND_BUFFER_PTT_OFF 16           
-#define SERIAL_SEND_BUFFER_TIMED_KEY_DOWN 17    
-#define SERIAL_SEND_BUFFER_TIMED_WAIT 18        
-#define SERIAL_SEND_BUFFER_NULL 19              
-#define SERIAL_SEND_BUFFER_PROSIGN 20           
-#define SERIAL_SEND_BUFFER_HOLD_SEND 21         
-#define SERIAL_SEND_BUFFER_HOLD_SEND_RELEASE 22 
+#define SERIAL_SEND_BUFFER_WPM_CHANGE 14
+#define SERIAL_SEND_BUFFER_PTT_ON 15
+#define SERIAL_SEND_BUFFER_PTT_OFF 16
+#define SERIAL_SEND_BUFFER_TIMED_KEY_DOWN 17
+#define SERIAL_SEND_BUFFER_TIMED_WAIT 18
+#define SERIAL_SEND_BUFFER_NULL 19
+#define SERIAL_SEND_BUFFER_PROSIGN 20
+#define SERIAL_SEND_BUFFER_HOLD_SEND 21
+#define SERIAL_SEND_BUFFER_HOLD_SEND_RELEASE 22
 #define SERIAL_SEND_BUFFER_MEMORY_NUMBER 23
 #define SERIAL_SEND_BUFFER_TX_CHANGE 24
 #define SERIAL_SEND_BUFFER_SPECIAL_END 25
@@ -220,7 +222,7 @@
 #define CLI_MILL_MODE_PADDLE_SEND 1
 #define CLI_MILL_MODE_KEYBOARD_RECEIVE 2
 
-#define COMMAND_SPEED_MODE_KEYER_WPM 0 
+#define COMMAND_SPEED_MODE_KEYER_WPM 0
 #define COMMAND_SPEED_MODE_COMMAND_MODE_WPM 1
 
 #define SD_CARD_UNINITIALIZED 0