Add stuff for cmake find_package

- Add build* to gitignore
- Fix year in license file
- other changes are result of clang-format

CMakeLists.txt

@@ -1,5 +1,7 @@
 cmake_minimum_required(VERSION 3.22)
 
+include(GNUInstallDirs)
+
 # Set Project
 project(palladium LANGUAGES C CXX VERSION 0.6.0)
 
@@ -10,6 +12,9 @@ include(cmake/palladium.cmake)
 option(PD_BUILD_TESTS "Sets if TestApp and TestBench get build" OFF)
 option(PD_BUILD_SHARED "Build Shared Library" OFF)
 option(PD_BUILD_TOOLS "Build Palladium Tools" OFF)
+option(PD_BUILD_DESKTOP "Build Desktop Backend" OFF)
+option(PD_BUILD_3DS "Build 3ds Backend" OFF)
+option(PD_BUNDLE_GLFW "Bundle GLFW in install" OFF)
 
 if(${PD_BUILD_TOOLS})
     add_subdirectory(tools)
@@ -73,7 +78,13 @@ else()
     target_compile_definitions(palladium PUBLIC -DPD_BUILD_STATIC)
 endif()
 
-target_include_directories(palladium PUBLIC ${CMAKE_CURRENT_SOURCE_DIR}/include)
+add_library(palladium::palladium ALIAS palladium)
+
+target_include_directories(palladium
+    PUBLIC
+    $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}/include>
+    $<INSTALL_INTERFACE:include>
+)
 
 if(${CMAKE_SYSTEM_NAME} STREQUAL "Nintendo3DS")
     target_compile_options(palladium PRIVATE
@@ -88,8 +99,47 @@ target_compile_options(palladium PRIVATE
     $<$<CONFIG:Release>:-O3>
 )
 
-install(DIRECTORY include DESTINATION ".")
-install(TARGETS palladium)
+if(PD_BUILD_DESKTOP AND NOT PD_BUILD_3DS)
+    add_subdirectory(backends/desktop)
+endif()
+if(PD_BUILD_3DS AND NOT PD_BUILD_DESKTOP)
+    add_subdirectory(backends/3ds)
+endif()
+
+install(TARGETS palladium
+    EXPORT palladiumTargets
+    ARCHIVE DESTINATION ${CMAKE_INSTALL_LIBDIR}
+    LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR}
+    RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR}
+)
+install(DIRECTORY include/
+    DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}
+)
+install(EXPORT palladiumTargets
+    FILE palladiumTargets.cmake
+    NAMESPACE palladium::
+    DESTINATION ${CMAKE_INSTALL_LIBDIR}/cmake/palladium
+)
+
+include(CMakePackageConfigHelpers)
+configure_package_config_file(
+    cmake/palladiumConfig.cmake.in
+    ${CMAKE_CURRENT_BINARY_DIR}/palladiumConfig.cmake
+    INSTALL_DESTINATION ${CMAKE_INSTALL_LIBDIR}/cmake/palladium
+)
+
+write_basic_package_version_file(
+    ${CMAKE_CURRENT_BINARY_DIR}/palladiumConfigVersion.cmake
+    VERSION ${PROJECT_VERSION}
+    COMPATIBILITY SameMajorVersion
+)
+
+install(FILES
+    ${CMAKE_CURRENT_BINARY_DIR}/palladiumConfig.cmake
+    ${CMAKE_CURRENT_BINARY_DIR}/palladiumConfigVersion.cmake
+    DESTINATION ${CMAKE_INSTALL_LIBDIR}/cmake/palladium
+)
+
 
 find_program(CLANG_FORMAT clang-format)