Add back support for Godot 4.3

Author: dsnopek

.github/workflows/ci-scons.yml

@@ -51,6 +51,16 @@ jobs:
             godot-test-versions: "4.4-stable 4.5-stable"
             cache-name: linux-x86_64-godot44
 
+          - name: 🐧 Linux (GCC) for Godot 4.3
+            os: ubuntu-22.04
+            platform: linux
+            artifact-name: godot-cpp-linux-glibc2.27-x86_64-release-godot43
+            artifact-path: bin/libgodot-cpp.linux.template_release.x86_64.a
+            run-tests: true
+            api-version: 4.3
+            godot-test-versions: "4.3-stable 4.4-stable 4.5-stable"
+            cache-name: linux-x86_64-godot43
+
           - name: 🏁 Windows (x86_64, MSVC)
             os: windows-2022
             platform: windows

binding_generator.py

@@ -1135,9 +1135,11 @@ def generate_builtin_class_header(builtin_api, size, used_classes, fully_used_cl
     if class_name == "Dictionary":
         result.append("\tconst Variant &operator[](const Variant &p_key) const;")
         result.append("\tVariant &operator[](const Variant &p_key);")
+        result.append("#if GODOT_VERSION_MINOR >= 4")
         result.append(
             "\tvoid set_typed(uint32_t p_key_type, const StringName &p_key_class_name, const Variant &p_key_script, uint32_t p_value_type, const StringName &p_value_class_name, const Variant &p_value_script);"
         )
+        result.append("#endif")
 
     result.append("};")
 
@@ -1888,7 +1890,9 @@ def generate_engine_class_header(class_api, used_classes, fully_used_classes, us
                     # condition returns false (in such cases it can't compile due to ambiguity).
                     f"\t\tif constexpr (!std::is_same_v<decltype(&B::{method_name}), decltype(&T::{method_name})>) {{"
                 )
-                result.append(f"\t\t\tBIND_VIRTUAL_METHOD(T, {method_name}, {method['hash']});")
+                # If using an `extension_api.json` from Godot 4.3 or earlier, there will be no hash for virtual functions.
+                method_hash = method.get("hash", 0)
+                result.append(f"\t\t\tBIND_VIRTUAL_METHOD(T, {method_name}, {method_hash});")
                 result.append("\t\t}")
 
     result.append("\t}")

cmake/godotcpp.cmake

@@ -119,7 +119,7 @@ function(godotcpp_options)
         CACHE STRING
         "The Godot API version to target (ex \"4.5\") using one of the included API JSON files"
     )
-    set_property(CACHE GODOTCPP_API_VERSION PROPERTY STRINGS ";4.4;4.5;4.6")
+    set_property(CACHE GODOTCPP_API_VERSION PROPERTY STRINGS ";4.3;4.4;4.5;4.6")
     set(GODOTCPP_GDEXTENSION_DIR
         "gdextension"
         CACHE PATH