fix Arduino examples

use program space pointer - PSTR

Author: ak75

examples/Shell_Basic/Shell_Basic.ino

@@ -27,8 +27,8 @@ void setup()
   shell_init(shell_reader, shell_writer, 0);
 
   // Add commands to the shell
-  shell_register(command_mycommand, "mycommand");
-  shell_register(command_othercommand, "othercommand");
+  shell_register(command_mycommand, PSTR("mycommand"));
+  shell_register(command_othercommand, PSTR("othercommand"));
 }
 
 void loop()

examples/Shell_Command_Args/Shell_Command_Args.ino

@@ -27,7 +27,7 @@ void setup()
   shell_init(shell_reader, shell_writer, 0);
 
   // Add commands to the shell
-  shell_register(command_test, "test");
+  shell_register(command_test, PSTR("test"));
 }
 
 void loop()

examples/Shell_IO_Control/Shell_IO_Control.ino

@@ -13,7 +13,7 @@ void setup()
   shell_init(shell_reader, shell_writer, 0);
 
   // Add commands to the shell
-  shell_register(command_ioctrl, (const char *) "ioctrl");
+  shell_register(command_ioctrl, PSTR("ioctrl"));
 }
 
 void loop()

examples/Shell_Minimum/Shell_Minimum.ino

@@ -25,7 +25,7 @@ void setup()
   shell_init(shell_reader, shell_writer, 0);
 
   // Add commands to the shell
-  shell_register(command_example, "example");
+  shell_register(command_example, PSTR("example"));
 }
 
 void loop()

examples/Shell_RGB_Control/Shell_RGB_Control.ino

@@ -33,7 +33,7 @@ void setup()
   shell_init(shell_reader, shell_writer, 0);
 
   // Add commands to the shell
-  shell_register(command_rgbled, "rgbled");
+  shell_register(command_rgbled, PSTR("rgbled"));
 }
 
 void loop()

examples/Shell_Telnet/Shell_Telnet.ino

@@ -63,7 +63,7 @@ void setup()
   shell_init(shell_reader, shell_writer, 0);
 
   // Add commands to the shell
-  shell_register(command_rgbled, "rgbled");
+  shell_register(command_rgbled, PSTR("rgbled"));
 
 }