backend, frontends: callbacks refactoring:

- launchAction is now async, and return a dictionary for its result
    - no more action_id, actionResult* are deprecated
    - callback system is about to be unified

src/bridge/bridge_constructor/bridge_template.ini

@@ -104,6 +104,7 @@ doc_param_0=entity_jid: JID of the contact removed from roster
 doc_param_1=%(doc_profile)s
 
 [askConfirmation]
+deprecated=
 type=signal
 category=core
 sig_in=ssa{ss}s
@@ -116,6 +117,7 @@ doc_param_2=data: conf_type dependent data
 doc_param_3=%(doc_profile)s
 
 [actionResult]
+deprecated=
 type=signal
 category=core
 sig_in=ssa{ss}s
@@ -130,6 +132,7 @@ doc_param_2=data: answer_type specific data
 doc_param_3=%(doc_profile)s
 
 [actionResultExt]
+deprecated=
 type=signal
 category=core
 sig_in=ssa{sa{ss}}s
@@ -533,18 +536,21 @@ doc_param_0=entity_jid: JID to remove from roster
 doc_param_1=%(doc_profile_key)s
 
 [launchAction]
+async=
 type=method
 category=core
 sig_in=sa{ss}s
-sig_out=s
+sig_out=a{ss}
 param_2_default="@DEFAULT@"
-doc=Launch a specific action
-doc_param_0=action_type: type of the action which can be:
- - button: A button is pushed
-doc_param_1=data: action_type dependant data
+doc=Launch a registred action
+doc_param_0=callback_id: id of the registred callback
+doc_param_1=data: optional data
 doc_param_2=%(doc_profile_key)s
+doc_return=dict where key can be:
+    - xmlui: a XMLUI need to be displayed
 
 [confirmationAnswer]
+deprecated=
 type=method
 category=core
 sig_in=sba{ss}s