Better differentiation between pause/paused resume/resumed states

Use OCTOPRINT_ASK_* for the present form of actions. In these cases the
host will perform the pausing manouvers for us.

Use OCTOPRINT_* instead for the past tense forms when we are in charge.

Also always emit the action, whether we are or not sd-printing. This is
due to the new Stopped handling behaving correctly in either case.

Firmware/messages.cpp

@@ -192,9 +192,9 @@ const char MSG_ENDSTOP_OPEN[] PROGMEM_N1 = "open"; ////
 const char MSG_POWERUP[] PROGMEM_N1 = "PowerUp"; ////
 const char MSG_ERR_STOPPED[] PROGMEM_N1 = "Printer stopped due to errors. Supervision required."; ////
 const char MSG_ENDSTOP_HIT[] PROGMEM_N1 = "TRIGGERED"; ////
-const char MSG_OCTOPRINT_PAUSE[] PROGMEM_N1 = "// action:pause"; ////
+const char MSG_OCTOPRINT_ASK_PAUSE[] PROGMEM_N1 = "// action:pause"; ////
 const char MSG_OCTOPRINT_PAUSED[] PROGMEM_N1 = "// action:paused"; ////
-const char MSG_OCTOPRINT_RESUME[] PROGMEM_N1 = "// action:resume"; ////
+const char MSG_OCTOPRINT_ASK_RESUME[] PROGMEM_N1 = "// action:resume"; ////
 const char MSG_OCTOPRINT_RESUMED[] PROGMEM_N1 = "// action:resumed"; ////
 const char MSG_OCTOPRINT_CANCEL[] PROGMEM_N1 = "// action:cancel"; ////
 const char MSG_FANCHECK_EXTRUDER[] PROGMEM_N1 = "Err: EXTR. FAN ERROR"; ////c=20

Firmware/messages.h

@@ -197,9 +197,9 @@ extern const char MSG_ERR_STOPPED[];
 extern const char MSG_ENDSTOP_HIT[];
 extern const char MSG_EJECT_FILAMENT[];
 extern const char MSG_CUT_FILAMENT[];
-extern const char MSG_OCTOPRINT_PAUSE[];
+extern const char MSG_OCTOPRINT_ASK_PAUSE[];
 extern const char MSG_OCTOPRINT_PAUSED[];
-extern const char MSG_OCTOPRINT_RESUME[];
+extern const char MSG_OCTOPRINT_ASK_RESUME[];
 extern const char MSG_OCTOPRINT_RESUMED[];
 extern const char MSG_OCTOPRINT_CANCEL[];
 extern const char MSG_FANCHECK_EXTRUDER[];

Firmware/ultralcd.cpp

@@ -1091,10 +1091,7 @@ void lcd_pause_print()
 {
     stop_and_save_print_to_ram(0.0, -default_retraction);
 
-    if (!card.sdprinting) {
-        SERIAL_ECHOLNRPGM(MSG_OCTOPRINT_PAUSED);
-    }
-
+    SERIAL_ECHOLNRPGM(MSG_OCTOPRINT_PAUSED);
     isPrintPaused = true;
 
     // return to status is required to continue processing in the main loop!
@@ -1105,7 +1102,7 @@ void lcd_pause_print()
 //! @brief Send host action "pause"
 void lcd_pause_usb_print()
 {
-    SERIAL_PROTOCOLLNRPGM(MSG_OCTOPRINT_PAUSE);
+    SERIAL_PROTOCOLLNRPGM(MSG_OCTOPRINT_ASK_PAUSE);
 }
 
 static void lcd_move_menu_axis();
@@ -5737,7 +5734,7 @@ void lcd_resume_usb_print()
     if (!resume_print_checks()) return;
 
     // resume the usb host
-    SERIAL_PROTOCOLLNRPGM(MSG_OCTOPRINT_RESUME);
+    SERIAL_PROTOCOLLNRPGM(MSG_OCTOPRINT_ASK_RESUME);
 }
 
 static void change_sheet()