Changed signature of grbl.on_homing complete event to include the cycle flags.

Added definitions for up to four additional digital aux I/O ports.
Added real time report of selected spindle in multi spindle configurations. Reported on changes only.
Removed limits override input invert config, for safety reasons it is always active low.
Added HAL entry points for second RGB channel, renamed first from hal.rgb to hal.rgb0.
Added option to setting $22 to force use of limit switches for homing when homing inputs are available in the driver/board combo.
Improved handling of aux I/O pins when claimed for core functions.
Added flag to $9 for disabling laser mode capability for primary PWM spindle. Allows leaving laser mode enabled when a secondary PWM spindle is available and this is used to control a laser.
Added some generic setting definitions for stepper drivers, currently used by the motors plugin.

machine_limits.c

@@ -3,22 +3,22 @@
 
   Part of grblHAL
 
-  Copyright (c) 2017-2023 Terje Io
+  Copyright (c) 2017-2024 Terje Io
   Copyright (c) 2012-2016 Sungeun K. Jeon for Gnea Research LLC
   Copyright (c) 2009-2011 Simen Svale Skogsrud
 
-  Grbl is free software: you can redistribute it and/or modify
+  grblHAL is free software: you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation, either version 3 of the License, or
   (at your option) any later version.
 
-  Grbl is distributed in the hope that it will be useful,
+  grblHAL is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
-  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
   GNU General Public License for more details.
 
   You should have received a copy of the GNU General Public License
-  along with Grbl.  If not, see <http://www.gnu.org/licenses/>.
+  along with grblHAL. If not, see <http://www.gnu.org/licenses/>.
 */
 
 #include <math.h>
@@ -82,7 +82,7 @@ ISR_CODE static axes_signals_t ISR_FUNC(homing_signals_select)(home_signals_t si
 ISR_CODE void ISR_FUNC(limit_interrupt_handler)(limit_signals_t state) // DEFAULT: Limit pin change interrupt process.
 {
     // Ignore limit switches if already in an alarm state or in-process of executing an alarm.
-    // When in the alarm state, Grbl should have been reset or will force a reset, so any pending
+    // When in the alarm state, grblHAL should have been reset or will force a reset, so any pending
     // moves in the planner and stream input buffers are all cleared and newly sent blocks will be
     // locked out until a homing cycle or a kill lock command. Allows the user to disable the hard
     // limit setting if their limits are constantly triggering after a reset and move their axes.
@@ -490,7 +490,7 @@ static bool homing_cycle (axes_signals_t cycle, axes_signals_t auto_square)
     }
 
     // The active cycle axes should now be homed and machine limits have been located. By
-    // default, Grbl defines machine space as all negative, as do most CNCs. Since limit switches
+    // default, grblHAL defines machine space as all negative, as do most CNCs. Since limit switches
     // can be on either side of an axes, check and set axes machine zero appropriately. Also,
     // set up pull-off maneuver from axes limit switches that have been homed. This provides
     // some initial clearance off the switches and should also help prevent them from falsely
@@ -539,8 +539,6 @@ status_code_t limits_go_home (axes_signals_t cycle)
             return Status_LimitsEngaged; // Auto squaring with limit switch asserted is not allowed.
     }
 
-    tc_clear_tlo_reference(cycle);
-
     return grbl.home_machine(cycle, auto_square) ? Status_OK : Status_Unhandled;
 }