Show task board menu item in project menu

fix highlighting of active Task board menu entry
use redmine jump box renderer

If i want to change project, i want to see all projects available for me. Redmine behavior also offers allprojects and jumps to Overview when a tab is not available.

Fixes #834
Fixes #631
remove master backlog from breadcrumb if rendered in header, this information is confusing. Keep it in standalone mode, the link is important
Merge branch 'feature/jumpbox'