Exposed the shared property, the scenario is the following: ProjectSe…

…ttings is a singleton, and we surface static methods, but without access to this, we can not get access to the Object class methods, which ProjectSettings leverages

Generator/Generator/ClassGen.swift

@@ -639,7 +639,7 @@ func processClass (cdef: JGodotExtensionAPIClass, outputDir: String?) async {
  p (typeDecl) {
  if isSingleton {
  p ("/// The shared instance of this class")
- p ("static var shared: \(cdef.name) =", suffix: "()") {
+ p ("public static var shared: \(cdef.name) =", suffix: "()") {
  p ("withUnsafePointer (to: &\(cdef.name).className.content)", arg: " ptr in") {
  p ("\(cdef.name) (nativeHandle: gi.global_get_singleton (ptr)!)")
  }