v1.1e: New laser features. G-code parser refactoring. CoreXY homing fix.

- Increment to v1.1e due to new laser features.

- After several discussions with some prominent laser people, a few
tweaks to the new laser mode has been installed.

- LASER: M3 behaves in a constant power mode.

- LASER: M4 behaves in a dynamic power mode, where the laser power is
automatically adjusted based on how fast Grbl is moving relative to the
programmed feed rate. This is the same as the  CONSTANT_POWER_PER_RATE
config.h option in the last version. NOTE: When not in motion in M4,
Grbl automatically turns off the laser. Again, it only operates while
moving!

- LASER: Only G1, G2, and G3 motion modes will turn on the laser. So,
this means that G0, G80 motion modes will always keep the laser
disabled. No matter if M3/M4 are active!

- LASER: A spindle stop override is automatically invoked when a laser
is put in a feed hold. This behavior may be disabled by a config.h
option.

- Lots of little tweaks to the g-code parser to help streamline it a
bit. It should no effect how it operates. Generally just added a parser
flag to track and execute certain scenarios a little more clearly.

- Jog motions now allow line numbers to be passed to it and will be
displayed in the status reports.

- Fixed a CoreXY homing bug.

- Fixed an issue when $13 is changed, WCO isn’t sent immediately.

- Altered how spindle PWM is set in the stepper ISR. Updated on a step
segment basis now. May need to change this back if there are any
oddities from doing this.

- Updated some documentation. Clarified why M0 no longer showing up in
$G and why a `1.` floating point values are shown with no decimals,
like so `1`.

grbl/motion_control.c

@@ -246,7 +246,7 @@ void mc_homing_cycle(uint8_t cycle_mask)
 
 // Perform tool length probe cycle. Requires probe switch.
 // NOTE: Upon probe failure, the program will be stopped and placed into ALARM state.
-uint8_t mc_probe_cycle(float *target, plan_line_data_t *pl_data, uint8_t is_probe_away, uint8_t is_no_error)
+uint8_t mc_probe_cycle(float *target, plan_line_data_t *pl_data, uint8_t parser_flags)
 {
   // TODO: Need to update this cycle so it obeys a non-auto cycle start.
   if (sys.state == STATE_CHECK_MODE) { return(GC_PROBE_CHECK_MODE); }
@@ -256,6 +256,8 @@ uint8_t mc_probe_cycle(float *target, plan_line_data_t *pl_data, uint8_t is_prob
   if (sys.abort) { return(GC_PROBE_ABORT); } // Return if system reset has been issued.
 
   // Initialize probing control variables
+  uint8_t is_probe_away = bit_istrue(parser_flags,GC_PARSER_PROBE_IS_AWAY);
+  uint8_t is_no_error = bit_istrue(parser_flags,GC_PARSER_PROBE_IS_NO_ERROR);
   sys.probe_succeeded = false; // Re-initialize probe history before beginning cycle.
   probe_configure_invert_mask(is_probe_away);