cxx-qt-gen: split rust/types and cpp/types into a cxx utils module

This allows us to have a separate module for independent helpers
for dealing with syn, CXX, and C++ together.

Related to KDAB#404

crates/cxx-qt-gen/src/generator/mod.rs

@@ -6,3 +6,4 @@
 pub mod cpp;
 pub mod naming;
 pub mod rust;
+pub mod utils;

crates/cxx-qt-gen/src/generator/rust/mod.rs

@@ -10,7 +10,6 @@ pub mod property;
 pub mod qobject;
 pub mod signals;
 pub mod threading;
-pub mod types;
 
 use crate::generator::rust::qobject::GeneratedRustQObject;
 use crate::parser::Parser;

crates/cxx-qt-gen/src/generator/rust/property/setter.rs

@@ -5,7 +5,8 @@
 
 use crate::generator::{
     naming::{property::QPropertyName, qobject::QObjectName},
-    rust::{fragment::RustFragmentPair, types::is_unsafe_cxx_type},
+    rust::fragment::RustFragmentPair,
+    utils::rust::syn_type_is_cxx_bridge_unsafe,
 };
 use quote::quote;
 use syn::Type;
@@ -24,7 +25,7 @@ pub fn generate(
     let notify_ident = &idents.notify.rust;
 
     // Determine if unsafe is required due to an unsafe type
-    let has_unsafe = if is_unsafe_cxx_type(ty) {
+    let has_unsafe = if syn_type_is_cxx_bridge_unsafe(ty) {
         quote! { unsafe }
     } else {
         quote! {}