Added handling of inline namespaces

docs/test_cases/t00015.md

@@ -0,0 +1,54 @@
+# t00015 - Namespace fun
+## Config
+```yaml
+compilation_database_dir: ..
+output_directory: puml
+diagrams:
+  t00015_class:
+    type: class
+    glob:
+      - ../../tests/t00015/t00015.cc
+    using_namespace:
+      - clanguml::t00015
+    include:
+      namespaces:
+        - clanguml::t00015
+
+```
+## Source code
+```cpp
+namespace clanguml {
+namespace t00015 {
+
+namespace ns1 {
+inline namespace ns2_v1_0_0 {
+class A {
+};
+}
+
+namespace ns2_v0_9_0 {
+class [[deprecated]] A {};
+}
+
+namespace {
+class Anon final : public A {
+};
+}
+}
+
+namespace ns3 {
+
+namespace ns1::ns2 {
+class Anon : public t00015::ns1::A {
+};
+}
+
+class B : public ns1::ns2::Anon {
+};
+}
+}
+}
+
+```
+## Generated UML diagrams
+![t00015_class](./t00015_class.png "Namespace fun")