update to display possible selections for parent board in the right way (with the currently one selected or null if there are no parent boards)
also added new font "DK Cool Crayon.ttf"
some minor changes to boardmanagement styling #68
some fixes related to #117
some basic stuff change like refactoring '==' to '==='
implemented correct display of tickets form child boards or all tickets if on "Personal_Board".
Also fixed transition to child board from ticket menu #91