Update to SFML 3.1.0

- Require CMake 3.28 to match SFML

- Install HarfBuzz, MbedTLS and libssh2 for Linux CI builds

- Bump CSFML and NuGet package version to 3.1.0

tools/BuildMacOS.sh

@@ -1,7 +1,7 @@
 #!/bin/sh
 
-VERSION="3.0.2"
-VERSION_C="3.0.0"
+VERSION="3.1.0"
+VERSION_C="3.1.0"
 # BUILD_CSFML=FALSE
 BUILD_CSFML=TRUE
 BUILD_SFML=FALSE