libgpaste-settings-ui: add panel

Signed-off-by: Marc-Antoine Perennou <Marc-Antoine@Perennou.com>
gpaste-settings: port to new panel

Signed-off-by: Marc-Antoine Perennou <Marc-Antoine@Perennou.com>
libgpaste-settings-ui: add notebook

Signed-off-by: Marc-Antoine Perennou <Marc-Antoine@Perennou.com>
gpaste-settings: port to new notebook

Signed-off-by: Marc-Antoine Perennou <Marc-Antoine@Perennou.com>
libgpaste-settings-ui: add window

Signed-off-by: Marc-Antoine Perennou <Marc-Antoine@Perennou.com>
gpaste-settings: port to new window

Signed-off-by: Marc-Antoine Perennou <Marc-Antoine@Perennou.com>
update TODO

Signed-off-by: Marc-Antoine Perennou <Marc-Antoine@Perennou.com>
Merge branch 'libgpaste-settings-ui'

* libgpaste-settings-ui:
  update TODO
  gpaste-settings: port to new window
  libgpaste-settings-ui: add window
  gpaste-settings: port to new notebook
  libgpaste-settings-ui: add notebook
  gpaste-settings: port to new panel
  libgpaste-settings-ui: add panel