Tighter parsing of PrusaSlicer's own G-code annotations
to avoid clashes with comments inside user G-codes.
Also the GCodeReader was extended to return string_views instead
of copying a substring, and the GCodeProcessor was partially adapted
to string_views.
Custom printer with center of bed at 0,0 results in "toolpath outside print area" #3510
The G92 A0 B0 was incorrectly considered to be equal to just G92
to reset all axes.
