UI fixies

User feedback why dialog pages can't be accepted
Fix for https://github.com/CODeRUS/mitakuuluu2/issues/80
Fix for https://github.com/CODeRUS/mitakuuluu2/issues/81
Settings option for https://github.com/CODeRUS/mitakuuluu2/issues/73 and
https://github.com/CODeRUS/mitakuuluu2/issues/76
Fixed changing conversation background
Core fixies

Returned system chat notifier
Implemented settings for using wlan-only actions
Moved map request to own class
Fix for https://github.com/CODeRUS/mitakuuluu2/issues/79