1) If "support on build plate only" is enabled, the support columns are
newly trimmed to not land on top of an object. However this may make
the column too small to be stable.
2) Support enforcers newly take precedence over "supports on build plate only"
and over "don't support bridges".
3) Some refactoring of the support generator code for clarity: Reduced
some of the worst spagetti offenders.
Fixes Support generated even if support on build only activated #915
Fixes Bug: supports on build plate only #1340
Fixes Bottom interface layer is not generated , support on build plate only. (long open defect) #4199
Fixes option "supports on build plate only" does not work #3980
Fixes No support interface layers generated #1997
Fixes Feature Request: Option to combine results of 'support from build plate only' and 'support enforcers only' #2801
Fixes Support interface isn't generated: build plate only + blocked by model + support enforcer #3831
Fixes Support Enforcer don't create interface layers #5748
Fixes Support Enforcers Don't Have Top Loops/Raft #1870
Fixes Don't cancel support enforcers with "don't support bridges" #5105
The thread local storage variables for the random number generator
were replaced by an external context variable.
Thread local storage is a scarce resource.
1) The macro-processor sanitizes the source code line for invalid UTF-8
characters. Ideally these invalid characters would be replaced with ?,
they are just dropped as of now. Better than showing an empty string
when converting to wxString though.
2) G-code export collects full error message for 1st occurence of an error
for each custom G-code block.
3) The composite error message now displays the errors collected in 2).
4) The error window is now scaled bigger and the Slicer logo is smaller
if the text is to be rendered with monospaced font, as the monospaced
text will not be word wrapped.
In addition to an existing "layer_z" placeholder variable,
a new "max_layer_z" has been added to custom G-code sections accumulating
maximum of "layer_z" over the print. This value may be used for example
in the end G-code of a sequential print to lift the print head
up before travel over the whole print bed.
so that the ordering code at G-code export may work directly with
pointers to PrintInstances instead of with pair of <PrintObject, copy idx>.
Also the PrintInstance knows its source ModelInstance, which allows
sorting of PrintInstances for sequential printing in the order
they appear in Plater's object list.
Refactoring of GCode export of color changes, extruder switches etc,
so that the "color change" like extruder switches are applied first
at the Wipe Tower / G-code export, so that adding / removing
an extruder switch at the G-code preview slider does not invalidate
slicing.
