Integrated secondary non-HSK word list, refactored CharacterDAO
Made parser detect changes in CSV files and refresh db if changes are found
Added words for chapter 5 to SU CSV
Added SU-1 quiz
Pinyin now always shows when answer has been given
HSK2 wordlist added, main menu refactored/redesigned. Audio for HSK2 temporarily broken
Added files missing in previous commit
HSK2 word list and sounds added and working