* 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
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