added checkStudentExist in baseService

added pdf viewer

added err handling in interceprtor level

Added course component to institute pages

added a generic spinner

 added common institute select

added css change

add new reg changes

removed merege err

course filter added

filters added for admin screens

segregated exam cycle se=lect & shrd ques ppr comp

Added a reusable select component in add new regn component

manage ques paper course selcet added

Added a reusable select component in the regd student component

added shared course select component