[FrontEnd] Removed unused imports in finalize activity
[FrontEnd] Used alert dialogs instead of toasts for errors on finalize screen
[FrontEnd] Removed unused imports and organised used ones to be inline with android standards
[FrontEnd] Removed ability to use back button to dismiss certain alert dialogs
[FrontEnd] Removed unused imports from finalize screen
[FrontEnd] Removed unused elements from main marking screen layout file
[FrontEnd] Implemented buttons to navigate to next/previous mark display
[FrontEnd] Fixed mark display indexing
[FrontEnd] Implemented solution to X problem (untested)
[FrontEnd] Changed last few lines in gesture recog method