see extended description

- very good refactoring:
- get rid of the WorkerWithFilters interface and its subclasses;
- added StandardFilters and MoreFilters classes that implement Filter
interface but presents several filters. These classes replaces previous
WorkerWithFilters subclasses;
- renamed Filters to FilterSet;
- combine StandardFilters and MoreFilters in one class named Filters
that groups both of filter types;
- and other things...

- click on a marker on MainScreen shows PartnerPointsInfoPanelFragment
on the screen and select clicked marker

- PartnerPointsInfoPanelFragment is fragment (new fragment, created
today), that displays info about all partner points which placed in the
location specified by the clicked marker

!!!!! BUG
!!!!! NEED TO FIX
When user clicks on marker on main screen, then opens filter activity,
chooses some filters on it, returns to main screen, then the clicked
marker becomes unselected even if it is still visible (in other words,
not hided by choosen filters)