[cmake] refactor: CPM over vcpkg (#250)

Completely replaces vcpkg with CPM for all "system" dependencies. Primarily needed for Android and Windows. Also uses my OpenSSL CI for those two platforms.

In theory, improves configure and build time by a LOT and makes things much easier to manage

Reviewed-on: eden-emu/eden#250
Reviewed-by: Lizzie <lizzie@eden-emu.dev>

.patch/cpp-jwt/0001-no-install.patch

@@ -0,0 +1,47 @@
+diff --git a/CMakeLists.txt b/CMakeLists.txt
+index 8c1761f..52c4ca4 100644
+--- a/CMakeLists.txt
++++ b/CMakeLists.txt
+@@ -69,42 +69,3 @@ endif()
+ if(CPP_JWT_BUILD_EXAMPLES)
+   add_subdirectory(examples)
+ endif()
+-
+-# ##############################################################################
+-# INSTALL
+-# ##############################################################################
+-
+-include(GNUInstallDirs)
+-include(CMakePackageConfigHelpers)
+-set(CPP_JWT_CONFIG_INSTALL_DIR ${CMAKE_INSTALL_DATADIR}/cmake/${PROJECT_NAME})
+-
+-install(TARGETS ${PROJECT_NAME} EXPORT ${PROJECT_NAME}Targets)
+-install(
+-  EXPORT ${PROJECT_NAME}Targets
+-  DESTINATION ${CPP_JWT_CONFIG_INSTALL_DIR}
+-  NAMESPACE ${PROJECT_NAME}::
+-  COMPONENT dev)
+-configure_package_config_file(cmake/Config.cmake.in ${PROJECT_NAME}Config.cmake
+-                              INSTALL_DESTINATION ${CPP_JWT_CONFIG_INSTALL_DIR}
+-                              NO_SET_AND_CHECK_MACRO)
+-write_basic_package_version_file(${PROJECT_NAME}ConfigVersion.cmake
+-                                 COMPATIBILITY SameMajorVersion
+-                                 ARCH_INDEPENDENT)
+-install(
+-  FILES ${CMAKE_CURRENT_BINARY_DIR}/${PROJECT_NAME}Config.cmake
+-        ${CMAKE_CURRENT_BINARY_DIR}/${PROJECT_NAME}ConfigVersion.cmake
+-  DESTINATION ${CPP_JWT_CONFIG_INSTALL_DIR}
+-  COMPONENT dev)
+-
+-if(NOT CPP_JWT_USE_VENDORED_NLOHMANN_JSON)
+-  set(CPP_JWT_VENDORED_NLOHMANN_JSON_INSTALL_PATTERN PATTERN "json" EXCLUDE)
+-endif()
+-install(
+-  DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}/include/jwt/
+-  DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}/jwt
+-  COMPONENT dev
+-  FILES_MATCHING
+-  PATTERN "*.hpp"
+-  PATTERN "*.ipp"
+-  PATTERN "test" EXCLUDE
+-  ${CPP_JWT_VENDORED_NLOHMANN_JSON_INSTALL_PATTERN})