Add debug symbols to Release builds

By default, CMake Release builds are built without debug symbols. The
idea is that you use RelWithDebInfo if you want them. However,
RelWithDebInfo generates less optimized code, only inlining __inline
code. More specifically, RelWithDebInfo builds use the /Ob1 option, and
Release builds use /Ob2 [1,2].

In the end, we want to use Release for production code, but we also need
debug symbols for post-mortem analysis.

[1] conan-io/conan-center-index#1982 (comment)
[2] https://gitlab.kitware.com/cmake/cmake/-/blob/d7741457861816d50114801abc84d1d78afdc754/Modules/Platform/Windows-MSVC.cmake#L486-490

CMakeLists.txt

@@ -100,6 +100,15 @@ else()
 endif()
 
 
+# Always build Release with debug symbols as well
+if(MSVC)
+	add_compile_options("$<$<CONFIG:Release>:/Zi>")
+	add_link_options("$<$<CONFIG:Release>:/DEBUG>")
+else()
+	add_compile_options("$<$<CONFIG:Release>:-g>")
+endif()
+
+
 add_subdirectory(lass)
 if(TARGET Lass::lass_python)
 	add_subdirectory(pylass)