Add config option to skip installing docs

To save having to install and run Sphinx if you don't need the docs.

CMakeLists.txt

@@ -9,6 +9,7 @@ include(FetchContent)
 option(BUILD_SHARED_LIBS "Build a shared library" ON)
 option(RUN_CLANG_TIDY "Whether or not to run clang-tidy during build. Has no effect when using CMake's MSVC generator." OFF)
 option(LIBLOOT_BUILD_TESTS "Whether or not to build libloot's tests." ON)
+option(LIBLOOT_INSTALL_DOCS "Whether or not to install libloot's docs (which need to be built separately)." ON)
 
 set(CMAKE_POSITION_INDEPENDENT_CODE ON)
 set(CMAKE_CXX_STANDARD 17)
@@ -406,8 +407,10 @@ endif()
 install(DIRECTORY "${CMAKE_SOURCE_DIR}/include"
     DESTINATION ".")
 
-install(DIRECTORY "${CMAKE_BINARY_DIR}/docs/html/"
-    DESTINATION "docs")
+if(LIBLOOT_INSTALL_DOCS)
+    install(DIRECTORY "${CMAKE_BINARY_DIR}/docs/html/"
+        DESTINATION "docs")
+endif()
 
 ########################################
 # CPack

README.md

@@ -52,6 +52,7 @@ Parameter | Values | Default |Description
 ----------|--------|---------|-----------
 `BUILD_SHARED_LIBS` | `ON`, `OFF` | `ON` | Whether or not to build a shared libloot binary.
 `LIBLOOT_BUILD_TESTS` | `ON`, `OFF` | `ON` | Whether or not to build LOOT's tests.
+`LIBLOOT_INSTALL_DOCS` | `ON`, `OFF` | `ON` | Whether or not to install libloot's docs (which need to be built separately).
 `RUN_CLANG_TIDY` | `ON`, `OFF` | `OFF` | Whether or not to run clang-tidy during build. Has no effect when using CMake's MSVC generator.
 `ESPLUGIN_URL` | A URL | A GitHub release archive URL | The URL to get a source code archive from. This can be used to supply a local path if the archive has already been downloaded (e.g. for offline builds).
 `LIBLOADORDER_URL` | A URL | A GitHub release archive URL | The URL to get a source code archive from. This can be used to supply a local path if the archive has already been downloaded (e.g. for offline builds).