Zungmann's fixes to compile simulator on Mac OS X, part 1.

Compiling for Mac OS X needs some customizations noticed by zungmann
in the reprap forum:

http://forums.reprap.org/read.php?147,33082,279050#msg-279050
Zungmann's fixes to compile simulator on Mac OS X, part 2.

Here: .bss section syntax is different.
Align section attributes usage: always before the variable name.
DDA: clear flags of a queue entry earlier.

Formerly, once a wait for temp was given, this flag would stick
forever on this queue entry.

Spotted by Zungmann, thanks a lot!

http://forums.reprap.org/read.php?147,33082,280439#msg-280439
temp_achieved(): check only sensors/heaters turned on.

Problem spotted, described in a helpful manner and over-fixed
by @zungmann. This fix picks up his basic idea and implements it
with already existing state properties.
E3D Print head thermistor change
Merge remote-tracking branch 'main/experimental' into HEAD

Conflicts:
	analog.c
	arduino.h
	dda.c
	dda_queue.c
	extruder/analog.c
	gcode_parse.c
	simulator.h
Turn off DDA DEBUG by default
WIP: Crank up FEEDRATEs and turn off lookahead

Something slows me way down when trying to extrude.

   G1F5000X100E0 ; Moves quickly (5000)
   G1F15000X100E5 ; Moves slowly
   G1F15000X100E5 ; Moves even slower

This change is an attempt to hunt this bug down.