python: ability to set ConfigurationGroup values in all primitive types.

Not custom types like Magnum vectors yet, but at least the basics now.

src/python/corrade/test/test_utility.py

@@ -70,6 +70,9 @@ class Configuration(unittest.TestCase):
 
             a = utility.Configuration(filename)
             a['value'] = 'hello'
+            a['int'] = -168454764726
+            a['float'] = 3.14
+            a['bool'] = True
 
             a_refcount = sys.getrefcount(a)
             b = a.add_group('someGroup')
@@ -84,7 +87,7 @@ class Configuration(unittest.TestCase):
             a.save()
 
             with open(filename, 'r') as f:
-                self.assertEqual(f.read(), "value=hello\n[someGroup]\nsomeKey=42\n")
+                self.assertEqual(f.read(), "value=hello\nint=-168454764726\nfloat=3.14\nbool=1\n[someGroup]\nsomeKey=42\n")
 
     def test_save_different_filename(self):
         a = utility.Configuration()

src/python/corrade/utility.cpp

@@ -57,6 +57,15 @@ void utility(py::module_& m) {
         }, "Value", py::arg("key"))
         .def("__setitem__", [](Utility::ConfigurationGroup& self, const std::string& key, const std::string& value) {
             self.setValue(key, value);
+        }, "Set a value", py::arg("key"), py::arg("value"))
+        .def("__setitem__", [](Utility::ConfigurationGroup& self, const std::string& key, double value) {
+            self.setValue(key, value);
+        }, "Set a value", py::arg("key"), py::arg("value"))
+        .def("__setitem__", [](Utility::ConfigurationGroup& self, const std::string& key, std::int64_t value) {
+            self.setValue(key, value);
+        }, "Set a value", py::arg("key"), py::arg("value"))
+        .def("__setitem__", [](Utility::ConfigurationGroup& self, const std::string& key, bool value) {
+            self.setValue(key, value);
         }, "Set a value", py::arg("key"), py::arg("value"));
 
     py::class_<Utility::Configuration, Utility::ConfigurationGroup>{m, "Configuration", "Parser and writer for configuration files"}