Added nlohmann json as submodule

.github/workflows/build.yml

@@ -14,7 +14,7 @@ jobs:
       fail-fast: false
     steps:
     - name: Install Colobot dependencies
-      run: sudo add-apt-repository ppa:team-xbmc/ppa && sudo apt-get update && sudo apt-get install -y --no-install-recommends build-essential cmake libsdl2-dev libsdl2-image-dev libsdl2-ttf-dev libsndfile1-dev libvorbis-dev libogg-dev libpng-dev libglew-dev libopenal-dev libboost-dev libboost-system-dev libboost-filesystem-dev libboost-regex-dev libphysfs-dev gettext git po4a vorbis-tools librsvg2-bin xmlstarlet libglm-dev nlohmann-json3-dev
+      run: sudo apt-get update && sudo apt-get install -y --no-install-recommends build-essential cmake libsdl2-dev libsdl2-image-dev libsdl2-ttf-dev libsndfile1-dev libvorbis-dev libogg-dev libpng-dev libglew-dev libopenal-dev libboost-dev libboost-system-dev libboost-filesystem-dev libboost-regex-dev libphysfs-dev gettext git po4a vorbis-tools librsvg2-bin xmlstarlet libglm-dev
       if: matrix.container == ''
     - uses: actions/checkout@v2
     - name: Checkout the Google Test submodule
@@ -100,9 +100,9 @@ jobs:
       with:
         vcpkgGitCommitId: '210240b399fbc2f1363f4103b6a93629c207d7e3'
         vcpkgTriplet: ${{ matrix.vcpkg_triplet }}
-        vcpkgArguments: 'boost-system boost-filesystem boost-regex boost-lexical-cast boost-bimap boost-algorithm boost-property-tree boost-optional boost-range sdl2 sdl2-ttf sdl2-image glew libpng libwebp tiff gettext libsndfile libvorbis libogg openal-soft physfs glm nlohmann-json'
+        vcpkgArguments: 'boost-system boost-filesystem boost-regex boost-lexical-cast boost-bimap boost-algorithm boost-property-tree boost-optional boost-range sdl2 sdl2-ttf sdl2-image glew libpng libwebp tiff gettext libsndfile libvorbis libogg openal-soft physfs glm'
         # SHA-256 hash of the list of packages above, for caching purposes
-        appendedCacheKey: 'd04bfd69e02abc03ef692bf478791940bf4e82d4bcc45e5948a2c7b503b03848'
+        appendedCacheKey: '83b5e9a4328552da34acd5a2fb62a8c000261fd04755ff2368f967774e0db7cd'
     - name: Install external tools
       working-directory: ${{ github.workspace }}
       run: |
@@ -158,7 +158,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
     - name: Install Colobot dependencies
-      run: sudo add-apt-repository ppa:team-xbmc/ppa && sudo apt-get update && sudo apt-get install -y --no-install-recommends build-essential cmake libsdl2-dev libsdl2-image-dev libsdl2-ttf-dev libsndfile1-dev libvorbis-dev libogg-dev libpng-dev libglew-dev libopenal-dev libboost-dev libboost-system-dev libboost-filesystem-dev libboost-regex-dev libphysfs-dev gettext git po4a vorbis-tools librsvg2-bin xmlstarlet doxygen graphviz libglm-dev nlohmann-json3-dev
+      run: sudo apt-get update && sudo apt-get install -y --no-install-recommends build-essential cmake libsdl2-dev libsdl2-image-dev libsdl2-ttf-dev libsndfile1-dev libvorbis-dev libogg-dev libpng-dev libglew-dev libopenal-dev libboost-dev libboost-system-dev libboost-filesystem-dev libboost-regex-dev libphysfs-dev gettext git po4a vorbis-tools librsvg2-bin xmlstarlet doxygen graphviz libglm-dev
     - uses: actions/checkout@v2
     - name: Create build directory
       run: cmake -E make_directory build

.gitmodules

@@ -7,3 +7,6 @@
 	path = lib/googletest
 	url = git://github.com/google/googletest.git
 	ignore = all
+[submodule "lib/json"]
+	path = lib/json
+	url = https://github.com/nlohmann/json

CMakeLists.txt

@@ -314,13 +314,15 @@ find_package(PNG 1.2 REQUIRED)
 find_package(Gettext REQUIRED)
 find_package(PhysFS REQUIRED)
 find_package(glm CONFIG REQUIRED)
-find_package(nlohmann_json CONFIG REQUIRED)
 
 # Add target alias glm::glm for older versions of the library
 if(NOT TARGET glm::glm)
     add_library(glm::glm ALIAS glm)
 endif()
 
+add_subdirectory(lib/json)
+find_package(nlohmann_json CONFIG REQUIRED)
+
 set(Boost_USE_STATIC_LIBS ${BOOST_STATIC})
 set(Boost_USE_MULTITHREADED ON)
 set(Boost_USE_STATIC_RUNTIME ${USE_STATIC_RUNTIME})

lib/json

@@ -0,0 +1 @@
+Subproject commit e4643d1f1b03fc7a1d7b65f17e012ca93680cad8