Use the build system “meson” (close #32)

Replace the build system “setuptools” with “meson”.

src/meson.build

@@ -0,0 +1,38 @@
+pkgdatadir = join_paths(get_option('prefix'), get_option('datadir'), meson.project_name())
+moduledir = join_paths(pkgdatadir, 'mcg')
+
+python = import('python')
+
+conf = configuration_data()
+conf.set('PYTHON', python.find_installation('python3').full_path())
+conf.set('VERSION', meson.project_version())
+conf.set('localedir', join_paths(get_option('prefix'), get_option('localedir')))
+conf.set('pkgdatadir', pkgdatadir)
+
+configure_file(
+    input: 'mcg.in',
+    output: 'mcg',
+    configuration: conf,
+    install: true,
+    install_dir: get_option('bindir')
+)
+
+mcg_sources = [
+    '__init__.py',
+    'main.py',
+    'albumheaderbar.py',
+    'application.py',
+    'client.py',
+    'connectionpanel.py',
+    'coverpanel.py',
+    'infodialog.py',
+    'librarypanel.py',
+    'playlistpanel.py',
+    'serverpanel.py',
+    'shortcutsdialog.py',
+    'utils.py',
+    'window.py',
+    'zeroconf.py',
+]
+
+install_data(mcg_sources, install_dir: moduledir)