New alarm method. Re(re)organized status messages.

- Installed a new 'alarm' method to centralize motion kills across
alarm or reset events. Right now, this is controlled by system abort
and hard limits. But, in the future, a g-code parser error may call
this too as a safety feature.

- Re(re)organized status messages to just print all errors, regardless
from where it was called. This centralizes them into one place.

- Misc messages method installed for any user feedback that is not a
confirmation or error. Mainly so that there is a place to perform
warnings and such.

- New stuff installed and still made the flash size smaller by saving
flash space from clearing out repeated '\r\n' pgmstrings.

- Fixed a bug where hard limits message would print everytime a system
abort was sent.

settings.h

@@ -66,10 +66,10 @@ void settings_init();
 void settings_dump();
 
 // Handle settings command
-int8_t settings_execute_line(char *line);
+uint8_t settings_execute_line(char *line);
 
 // A helper method to set new settings from command line
-int8_t settings_store_setting(int parameter, float value);
+uint8_t settings_store_setting(int parameter, float value);
 
 // int8_t settings_execute_startup();