added styles for selected participant button
change layout for add participant page
updated view of participants page
improved ux
fixed bug with returning from tombstone state
update styles for remove selected participants button
partially implemented page for anonymous participants
added resources for images
separated anonymous participants by male and female
added image helper
finished anonymous page
chose default avatar randomly
same background for all icons
rounded participant items instead of square ones
rounded anonymous selector item
done with add participants page
Merge branch 'feature/add_participants_page_improvments' into develop
v. 0.4.0.0