feat: switch to dart isolate based local server

add local server

fixed windows version being unable to send post requests

back button now check's webview history before popping context

update

timetable pull method added to api service class

Merge pull request #1 from Whiskas101/attendance-summary-feature

fix trailing spaces in directory names for windows paths

config change for host ip

fetch method for attendance now defaults to cache

enabled storing theme info in sharedprefs

theme switching added

added personalisation screen route

connected attendance fetch to its provider

updated color scheme