* A *lot* of import fixes for flatpak
Aside, thank you @hadess for the majority of these fixes. You are the
base point for a lot of issues fixed during the creation of this
flatpak.
* Use slic3r::load_string_file
Boost 1.84 removed `boost::fs::load_string_file` so use the func located
in Utils.hpp
Fix a handful of precedence errors and 1 logic/precedence error. None of the code will compile as intended without these changes.
Co-authored-by: SoftFever <softfeverever@gmail.com>