* 1. Remove all global include_directories.
* 2. Move 3d party dependencies from src to budled deps if possible.
* Unify and enforce one way of including headers:
e.g. #include "libslic3r/GCode.hpp" vs #include "GCode.hpp"
(always use the "libslic3r/GCode.hpp" option).
* Make all dependencies (also header only) a cmake target.
Toolchages (wipe tower/no wipe tower) are always kept and if there are
any toolchanges, the objects are split at the begining of each instance,
while the first travel is always part of the "next" instance.
- code from @jschuh's functions moved into respective functions in LabelObjects class
- name no longer contains object_id, instance_id is newly 1-based
- replacing banned characters using std::replace_if
