libgpaste-applet: add text-mode to history and item

they are no-op for now

Signed-off-by: Marc-Antoine Perennou <Marc-Antoine@Perennou.com>
move some more code around

Signed-off-by: Marc-Antoine Perennou <Marc-Antoine@Perennou.com>
libgpaste-applet: actually implement text mode for item

Signed-off-by: Marc-Antoine Perennou <Marc-Antoine@Perennou.com>
libgpaste-applet: history: also apply text mode to current items

Signed-off-by: Marc-Antoine Perennou <Marc-Antoine@Perennou.com>
libgpaste-applet: history: also apply text mode to new items

Signed-off-by: Marc-Antoine Perennou <Marc-Antoine@Perennou.com>
libgpaste-applet: text-mode fixes

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

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