fixed crashes when loading a config.ini with "compatible_printers"
disabled export of "compatible_printers" into gcode and config.ini
Enabled compatibility of printing multiple objects with support / no support
with a wipe tower.
The incompatible presets are hidden in the tabs if show_incompatible_presets
is false. If show_incompatible_presets is true, there is a button to
show / hide the incompatible presets from the tab selector.
