context: Introduce GcalContext

This is just the bare minimum of what will become
the main context class of GNOME Calendar. As of
now, nothing creates or uses it.

src/gcal-context.h

@@ -0,0 +1,42 @@
+/* gcal-context.h
+ *
+ * Copyright 2019 Georges Basile Stavracas Neto <georges.stavracas@gmail.com>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ * SPDX-License-Identifier: GPL-3.0-or-later
+ */
+
+#pragma once
+
+#include "gcal-clock.h"
+#include "gcal-manager.h"
+#include "weather/gcal-weather-service.h"
+
+#include <glib-object.h>
+
+G_BEGIN_DECLS
+
+#define GCAL_TYPE_CONTEXT (gcal_context_get_type())
+G_DECLARE_FINAL_TYPE (GcalContext, gcal_context, GCAL, CONTEXT, GObject)
+
+GcalContext*         gcal_context_new                            (void);
+
+GcalClock*           gcal_context_get_clock                      (GcalContext        *self);
+
+GcalManager*         gcal_context_get_manager                    (GcalContext        *self);
+
+GcalWeatherService*  gcal_context_get_weather_service            (GcalContext        *self);
+
+G_END_DECLS