Updated Googletest submodule and include the P0267 as one

.gitmodules

@@ -4,3 +4,6 @@
 [submodule "thirdparty/googletest"]
 	path = thirdparty/googletest
 	url = https://github.com/abseil/googletest.git
+[submodule "thirdparty/P0267_RefImpl"]
+	path = thirdparty/P0267_RefImpl
+	url = https://github.com/cpp-io2d/P0267_RefImpl

CMakeLists.txt

@@ -12,7 +12,6 @@ project(OSM_A_star_search)
 set(LIBRARY_OUTPUT_PATH "${CMAKE_SOURCE_DIR}/lib")
 
 # Locate project prerequisites
-find_package(io2d REQUIRED)
 find_package(Cairo)
 find_package(GraphicsMagick)
 
@@ -21,14 +20,15 @@ set(IO2D_WITHOUT_SAMPLES 1)
 set(IO2D_WITHOUT_TESTS 1)
 
 # Add the pugixml and GoogleTest library subdirectories
+add_subdirectory(thirdparty/P0267_RefImpl)
 add_subdirectory(thirdparty/pugixml)
 add_subdirectory(thirdparty/googletest)
 
 # Add project executable
 add_executable(OSM_A_star_search src/main.cpp src/model.cpp src/render.cpp src/route_model.cpp src/route_planner.cpp)
 
 target_link_libraries(OSM_A_star_search
-    PRIVATE io2d::io2d
+    PRIVATE io2d
     PUBLIC pugixml
 )
 

README.md

@@ -26,10 +26,6 @@ git clone [email protected]:udacity/CppND-Route-Planning-Project.git --recurse-subm
   * Linux: gcc / g++ is installed by default on most Linux distros
   * Mac: same instructions as make - [install Xcode command line tools](https://developer.apple.com/xcode/features/)
   * Windows: recommend using [MinGW](http://www.mingw.org/)
-* IO2D
-  * Installation instructions for all operating systems can be found [here](https://github.com/cpp-io2d/P0267_RefImpl/blob/master/BUILDING.md)
-  * This library must be built in a place where CMake `find_package` will be able to find it
-
 
 ## Compiling and Running