core: add GPastePasswordItem

Signed-off-by: Marc-Antoine Perennou <Marc-Antoine@Perennou.com>
core: don't write password items to history

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

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

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

Signed-off-by: Marc-Antoine Perennou <Marc-Antoine@Perennou.com>
Merge branch 'password' into gpaste-3.10

* password:
  gpaste: add add-password
  client: add add_password
  daemon: add AddPassword
  core: don't write password items to history
  core: add GPastePasswordItem
core: read password from history file

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