Updating to catch 3

libs/FindCatch2.cmake

@@ -1,13 +1,13 @@
-CMAKE_MINIMUM_REQUIRED(VERSION 3.11)
+cmake_minimum_required(VERSION 3.11)
 
 
-if (NOT Catch2_FOUND)
-	Include(FetchContent)
-
-	FetchContent_Declare(
-		Catch2
-		GIT_REPOSITORY https://github.com/catchorg/Catch2.git
-		GIT_TAG        v2.13.6)
-
-	FetchContent_MakeAvailable(Catch2)
+include(FetchContent)
+FetchContent_Declare(Catch2
+	GIT_REPOSITORY https://github.com/catchorg/Catch2.git
+	GIT_TAG        v3.0.0-preview3
+)
+FetchContent_GetProperties(Catch2)
+if(NOT Catch2_POPULATED)
+	FetchContent_Populate(Catch2)
+	add_subdirectory(${catch2_SOURCE_DIR} ${catch2_BINARY_DIR} EXCLUDE_FROM_ALL)
 endif()