Added support for C++20 module based packages in class diagrams (#101)

tests/t00071/src/lib1.cppm

@@ -0,0 +1,13 @@
+export module t00071.app.lib1;
+
+export namespace clanguml::t00071 {
+class B { };
+
+template <typename T> class BB {
+    T t;
+};
+
+namespace detail {
+enum class BBB { bbb1, bbb2 };
+} // namespace detail
+}

tests/t00071/src/lib1mod1.cppm

@@ -0,0 +1,5 @@
+export module t00071.app.lib1.mod1;
+
+export namespace clanguml::t00071 {
+class D { };
+}

tests/t00071/src/lib1mod2.cppm

@@ -0,0 +1,5 @@
+export module t00071.app.lib1.mod2;
+
+export namespace clanguml::t00071 {
+class E { };
+}

tests/t00071/src/lib2.cppm

@@ -0,0 +1,13 @@
+export module t00071.app.lib2;
+
+export namespace clanguml::t00071 {
+class C { };
+
+template <typename T> class CC {
+    T t;
+};
+
+namespace detail {
+enum class CCC { ccc1, ccc2 };
+}
+}

tests/t00071/src/t00071_mod.cppm

@@ -0,0 +1,11 @@
+export module t00071.app;
+export import t00071.app.lib1;
+export import t00071.app.lib2;
+
+export namespace clanguml::t00071 {
+class A {
+    int get() { return a; }
+
+    int a;
+};
+}