Start phosh via gnome-session

Start a full gnome-session as gnome-shell does.

To get out of WIP status:

• Check on dev board or qemu

data/meson.build

+desktopconf = configuration_data()
+desktopconf.set('bindir', bindir)
+desktopconf.set('libexecdir', libexecdir)
+
+desktop_files = [
+  'sm.puri.Phosh.desktop',
+]
+foreach desktop_file : desktop_files
+  i18n.merge_file('desktop',
+    input: configure_file(
+      input: desktop_file + '.in.in',
+      output: desktop_file + '.in',
+      configuration: desktopconf
+    ),
+    output: desktop_file,
+    po_dir: '../po',
+    install: true,
+    install_dir: desktopdir,
+    type: 'desktop'
+  )
+endforeach
+
+sessions = [
+  'phosh.session',
+]
+foreach session: sessions
+  desktop = session + '.desktop'
+  i18n.merge_file(
+    session,
+    input: configure_file(
+      input: desktop + '.in.in',
+      output: desktop + '.in',
+      configuration: desktopconf
+    ),
+    output: session,
+    po_dir: '../po',
+    install: true,
+    install_dir: join_paths(sessiondir, 'sessions'),
+    type: 'desktop',
+  )
+endforeach
+
+runconf = configuration_data()
+runconf.set('bindir', bindir)
+runconf.set('libexecdir', libexecdir)
+runconf.set('pkgdatadir', pkgdatadir)
+runconf.set('wlrootsdir', join_paths(libexecdir, 'wlroots'))
+configure_file(
+  input: 'phosh.in',
+  output: 'phosh',
+  install_dir: bindir,
+  configuration: runconf,
+  install: true
+)
+
 schemas = ['sm.puri.phosh.gschema.xml']
 compiled = gnome.compile_schemas(
   build_by_default: true
@@ -7,3 +62,5 @@ install_data(
   schemas,
   install_dir: 'share/glib-2.0/schemas'
 )
+
+install_data('rootston.ini', install_dir : pkgdatadir)