* fixes: 999 CMake Warnings at src/dev-utils/CMakeLists.txt:39 (add_custom_command)
* cmake clenup: adds PUBLIC/PRIVATE to libslic3r; attempt to reduce warnigns from eigen
* src/*/CMakeLists.txt: adds SYSTEM to arget_include_directories()
* src/*/CMakeLists.txt: removes duplicate sources from lisbslic3r_sources and SLIC3R_GUI_SOURCES"
* .gititnore: adds CMakeLists.txt.user and CMakeLists.txt.autosave
* deps_src/*/CMakeLists.txt: adds SYSTEM to arget_include_directories()
* removes #pragma once from .cpp file
* fixes and refactors linux build scripts
- build_linux.sh: fixes wrong AppImage build folder; refactors script; enhances help text
- harmonizes names: BuildLinux.sh and BuildLinuxImage.sh
- fixes file permissions: cmake inherits .in-file permission; removes chmod 755 in scripts
- linux.d/debian: removes false positive error message
- updates documentation
* enables ANSI-colored output for GNU or Clang
* build_linux.sh: adds -p flag to disable PCH for boosting ccache hit rate
* Allow compilation on distributions based on Ubuntu/Debian (#8625)
* build_linux.sh: takes over changes from BuildLinux.sh
* CMakeLists.txt: removes leftovers, enables ANSI-colored output
* CMakeLists.txt: fixes issue where FORCE_COLORED_OUTPUT was not respected form environment (introduces -C cli arg)
* merges 5df4275: Make it easy to pass extra build args to deps and orca in BuildLinux.sh (#9648)