Copy shaders during build

In particular, the client was loading list.txt, not shader_list.txt
and it seems weird to be incoherent between the source and built
resources in this way.

CMakeLists.txt

@@ -60,6 +60,7 @@ target_compile_definitions(client_imgui PUBLIC -DIMGUI_IMPL_OPENGL_LOADER_GLAD)
 target_include_directories(client_imgui PUBLIC ${GLFW_INCLUDE_DIRS} ${GLUT_INCLUDE_DIR} ${OPENGL_INCLUDE_DIRS} ${GLAD_INCLUDE_DIRS} ${imgui_dir} ${igo_dir})
 target_link_libraries(client_imgui ${GLFW_LIBRARIES} ${GLUT_LIBRARY}
   ${OPENGL_LIBRARIES} ${GLAD_LIBRARIES} ${CMAKE_DL_LIBS} imgui imgui-glfw-gl3)
+file(COPY src/shaders DESTINATION .)
 
 # Server
 #target_include_directories(server "${PROJECT_SOURCE_DIR}/src/server")

src/client/client_imgui.cpp

@@ -107,7 +107,7 @@ int main(int argc, char** argv)
     // @BUG This is a temporary hack. When shader_program_registry is grown, the existing
     // entries lose data.
     shader_program_registry.reserve(10);
-    loadShaderProgramsFromFile("shaders/shader_programs.txt", &shader_registry, &shader_program_registry);
+    loadShaderProgramsFromFile("shaders/programs.txt", &shader_registry, &shader_program_registry);
     messager.registerCallback(&debug_messagebus_callback);
     int window_height, window_width;
     glm::mat4 projection;