Re: [sr-dev] [kamailio/kamailio] presence: add API endpoints to update presentity and notify watchers (#1417)

the problem i see with this: ``` int _api_pres_refresh_watchers(str *pres, str *event, int type, str *file_uri, str *filename) { return pres_refresh_watchers(pres, event, type, file_uri, filename); } ``` is the last 2 parameters are option, yet you have no way of knowing that by looking at the API function. therefore the API function becomes confusing. and another developer could spend a lot of time parsing through the code to figure out which params are required and which are optional (much like i just had to do in order to implement these 2 API functions). it will save developers a lot more time to create API functions with *only* required parameters