change projects / project icon + move project header to helpers

new file:   wica/templates/_project_header.jinja
modified:   wica/templates/application.jinja
modified:   wica/templates/project_evolve.jinja
modified:   wica/templates/project_replays.jinja
modified:   wica/templates/project_settings.jinja
modified:   wica/templates/projects.jinja
modified:   wica/templates/view_helpers.jinja