lib: Introduce Clapper GTK integration library

An easy to use GTK integration library. Meant as a GtkVideo alternative.

While GtkVideo is more of a simple example of video playback under GTK4, this
acts as a full-fledged video player in the form of a GtkWidget that can be placed
anywhere within application.

The widget offers customization options for both top header and bottom playback
controls panels. The Clapper playback API is exposed under widget "player" property
making it easy for the programmer to set media and control playback programically.

The new library will be distributed with Clapper player. This includes public headers
and GObject Introspection support.

Licensed under LGPL-2.1-or-later.

src/lib/clapper-gtk/po/hu.po

@@ -0,0 +1,66 @@
+# Hungarian translations for clapper-gtk package.
+# Copyright (C) 2024 THE clapper-gtk'S COPYRIGHT HOLDER
+# This file is distributed under the same license as the clapper-gtk package.
+# Automatically generated, 2024.
+#
+msgid ""
+msgstr ""
+"Project-Id-Version: clapper-gtk\n"
+"Report-Msgid-Bugs-To: \n"
+"POT-Creation-Date: 2024-04-05 20:50+0200\n"
+"PO-Revision-Date: 2024-03-07 20:49+0100\n"
+"Last-Translator: Automatically generated\n"
+"Language-Team: none\n"
+"Language: hu\n"
+"MIME-Version: 1.0\n"
+"Content-Type: text/plain; charset=UTF-8\n"
+"Content-Transfer-Encoding: 8bit\n"
+"Plural-Forms: nplurals=2; plural=(n != 1);\n"
+
+#: src/lib/clapper-gtk/ui/clapper-gtk-extra-menu-button.ui:9
+#: src/lib/clapper-gtk/clapper-gtk-extra-menu-button.c:227
+msgid "Video"
+msgstr ""
+
+#: src/lib/clapper-gtk/ui/clapper-gtk-extra-menu-button.ui:17
+#: src/lib/clapper-gtk/clapper-gtk-extra-menu-button.c:228
+msgid "Audio"
+msgstr ""
+
+#: src/lib/clapper-gtk/ui/clapper-gtk-extra-menu-button.ui:25
+#: src/lib/clapper-gtk/clapper-gtk-extra-menu-button.c:229
+msgid "Subtitles"
+msgstr ""
+
+#: src/lib/clapper-gtk/ui/clapper-gtk-extra-menu-button.ui:28
+msgid "Enabled"
+msgstr ""
+
+#: src/lib/clapper-gtk/ui/clapper-gtk-extra-menu-button.ui:32
+msgid "Open…"
+msgstr ""
+
+#: src/lib/clapper-gtk/ui/clapper-gtk-extra-menu-button.ui:75
+msgid "Mute"
+msgstr ""
+
+#: src/lib/clapper-gtk/ui/clapper-gtk-extra-menu-button.ui:119
+msgid "Reset"
+msgstr ""
+
+#: src/lib/clapper-gtk/clapper-gtk-stream-check-button.c:82
+#: src/lib/clapper-gtk/clapper-gtk-stream-check-button.c:126
+msgid "Undetermined"
+msgstr ""
+
+#: src/lib/clapper-gtk/clapper-gtk-stream-check-button.c:82
+msgid "Channels"
+msgstr ""
+
+#: src/lib/clapper-gtk/clapper-gtk-title-label.c:91
+msgid "No media"
+msgstr ""
+
+#: src/lib/clapper-gtk/clapper-gtk-title-label.c:103
+msgid "Unknown title"
+msgstr ""