Seperate ENDSTOP_INVERTING for X Y and Z

Added simple endstop filter.
Corrected M114 count display.

Marlin/stepper.h

@@ -31,6 +31,7 @@ void st_synchronize();
 
 // Set current position in steps
 void st_set_position(const long &x, const long &y, const long &z, const long &e);
+void st_set_e_position(const long &e);
 
 // Get current position in steps
 long st_get_position(char axis);
@@ -48,4 +49,4 @@ void endstops_hit_on_purpose(); //avoid creation of the message, i.e. after home
 extern block_t *current_block;  // A pointer to the block currently being traced
 
 
-#endif
+#endif