Handle acceleration settings in UVLO/power panic

Acceleration settings need to be saved in UVLO, since these are often
changed/set during a print. This is especially important for travel and
retract acceleration, which is usually set once per-print.

Saving and restoring is not 100% correct.

We save the current front-end value, which might ahead of the backend
when UVLO is triggered. Print acceleration, likely the most significant,
should be saved in the block buffer to be accurate.

Acceleration needs to be restored after the UVLO Z repositioning is
performed, using an M204 command. This is correct, however we don't save
the _temporary_ max acceleration limits set via M201, which could be
higher than the saved limits (via M500). This could result in lower
clamped values compared to the original print.

Maximum acceleration/jerk/feedrate limits should _all_ be saved in UVLO
in the future.

Firmware/Marlin_main.cpp

@@ -10963,6 +10963,10 @@ void uvlo_()
 #endif
 	eeprom_update_word((uint16_t*)(EEPROM_EXTRUDEMULTIPLY), (uint16_t)extrudemultiply);
 
+	eeprom_update_float((float*)(EEPROM_UVLO_ACCELL), cs.acceleration);
+	eeprom_update_float((float*)(EEPROM_UVLO_RETRACT_ACCELL), cs.retract_acceleration);
+	eeprom_update_float((float*)(EEPROM_UVLO_TRAVEL_ACCELL), cs.travel_acceleration);
+
     // Store the saved target
     eeprom_update_float((float*)(EEPROM_UVLO_SAVED_TARGET+0*4), saved_target[X_AXIS]);
     eeprom_update_float((float*)(EEPROM_UVLO_SAVED_TARGET+1*4), saved_target[Y_AXIS]);
@@ -11307,6 +11311,13 @@ void restore_print_from_eeprom(bool mbl_was_active) {
     sprintf_P(cmd, PSTR("G1 Z%f"), eeprom_read_float((float*)(EEPROM_UVLO_CURRENT_POSITION_Z)));
 	enquecommand(cmd);
 
+    // Restore acceleration settings
+    float acceleration = eeprom_read_float((float*)(EEPROM_UVLO_ACCELL));
+    float retract_acceleration = eeprom_read_float((float*)(EEPROM_UVLO_RETRACT_ACCELL));
+    float travel_acceleration = eeprom_read_float((float*)(EEPROM_UVLO_TRAVEL_ACCELL));
+    sprintf_P(cmd, PSTR("M204 P%f R%f T%f"), acceleration, retract_acceleration, travel_acceleration);
+    enquecommand(cmd);
+
   // Unretract.
     sprintf_P(cmd, PSTR("G1 E%0.3f F2700"), default_retraction);
     enquecommand(cmd);

Firmware/eeprom.h

@@ -319,8 +319,10 @@ static_assert(sizeof(Sheets) == EEPROM_SHEETS_SIZEOF, "Sizeof(Sheets) is not EEP
 | ^					| ^			| ^										| 00h 0			| ^						| PINDA has no temp compensation PINDA v1/2    		| ^				| ^
 | ^					| ^			| ^										| 01h 1			| ^						| PINDA has temp compensation aka SuperPINDA       	| ^				| ^
 | 0x0D15 3349		| char[20]	| EEPROM_PRUSA_SN						| SN[19] == 0	| ffffffffffffffff...	| PRUSA Serial number string						| PRUSA SN		| D3 Ax0d15 C20
+| 0x0D11 3345		| float		| EEPROM_UVLO_ACCELL                	| ???			| ff ff ff ffh			| Power panic saved normal acceleration     		| ???			| D3 Ax0d11 C4
+| 0x0D0D 3341		| float		| EEPROM_UVLO_RETRACT_ACCELL			| ???			| ff ff ff ffh			| Power panic saved retract acceleration     		| ???			| D3 Ax0d0d C4
+| 0x0D09 3337		| float		| EEPROM_UVLO_TRAVEL_ACCELL				| ???			| ff ff ff ffh			| Power panic saved travel acceleration     		| ???			| D3 Ax0d09 C4
 
-  
 | Address begin		| Bit/Type 	| Name 									| Valid values	| Default/FactoryReset	| Description 										| Gcode/Function| Debug code
 | :--:				| :--: 		| :--: 									| :--:			| :--:					| :--:												| :--:			| :--:
 | 0x0012 18			| uint16	| EEPROM_FIRMWARE_VERSION_END			| ???			| ff ffh 65535			| ???												| ???			| D3 Ax0012 C2
@@ -525,8 +527,13 @@ static Sheets * const EEPROM_Sheets_base = (Sheets*)(EEPROM_SHEETS_BASE);
 #define EEPROM_EXPERIMENTAL_VISIBILITY (EEPROM_ALTFAN_OVERRIDE-1) //uint8
 #define EEPROM_PINDA_TEMP_COMPENSATION (EEPROM_EXPERIMENTAL_VISIBILITY-1) //uint8
 #define EEPROM_PRUSA_SN (EEPROM_PINDA_TEMP_COMPENSATION-20) //char[20]
+
+#define EEPROM_UVLO_ACCELL (EEPROM_PRUSA_SN-4) // float
+#define EEPROM_UVLO_RETRACT_ACCELL (EEPROM_UVLO_ACCELL-4) // float
+#define EEPROM_UVLO_TRAVEL_ACCELL (EEPROM_UVLO_RETRACT_ACCELL-4) // float
+
 //This is supposed to point to last item to allow EEPROM overrun check. Please update when adding new items.
-#define EEPROM_LAST_ITEM EEPROM_PRUSA_SN
+#define EEPROM_LAST_ITEM EEPROM_UVLO_TRAVEL_ACCELL
 // !!!!!
 // !!!!! this is end of EEPROM section ... all updates MUST BE inserted before this mark !!!!!
 // !!!!!