GUI initialization extracted from PrusaSlicer.cpp to GUI_Init.cpp/hpp.

Implemented try/catch blocks for Slic3r exceptions and std::exceptions
with GUI error reporting. This is extremely important to report
corruption of PrusaSlicer.ini.

src/slic3r/CMakeLists.txt

@@ -73,6 +73,8 @@ set(SLIC3R_GUI_SOURCES
     GUI/PresetHints.hpp
     GUI/GUI.cpp
     GUI/GUI.hpp
+    GUI/GUI_Init.cpp
+    GUI/GUI_Init.hpp
     GUI/GUI_Preview.cpp
     GUI/GUI_Preview.hpp
     GUI/GUI_App.cpp