[Epic] Excel Checker Version 2.0

[pdrtzk]

Modularise Excel Checker and migrate to Kotlin

• [Excel-Checker] Add handlers to extend the functionality of the Excel Checker #1110
• [Excel-Checker] Implement result generation handlers #1144
• Refactor and Migrate the Submission Download/Upload Service to Kotlin #1113
• [Excel-Checker] Store dependency graph of solution file in database #1143
• Handle null Cells #1171
• [Excel-Checker V2] Recognise Subtasks #1180
• [API] improve the display of excel checker results #1420
• Use Configured Error messages
• support none formular cells
• Only store needed cells

Features

• [Excel-Checker] Detect Consequential errors #855
• Automated solution and checker configuration
• Formula metrics
• Misplacement correction
• Formatting and units checking
• Custom templates for each student
• Improve feedback for docents (and tutors)
• Optimise error analysis for input cells #1104
• [Excel-Checker] Improve error messages #1451

Utilities, ...

• [Excel-Checker] Generatation of dependency graph for solution file #1042
• Support of ODF
• Support of text formula evaluation
• Improve cell value parsing
• Improve formula reference parsing (support relative references, ...) e.g. with POIs 'Parsethings'

UI/UX

• [Excel-Checker] Visual creation of the Excel secondary configuration #767
• [WEB] show excel result in table #1109
• [WEB] improve the display of excel checker results  #1108