New update!

• Only notes with flashcards: true are parsed (this needs to be done manually on update, or simply create a flashcard with the modal)
• Remove necessity of "pre creating" decks in settings
• Deck are now only a name for flashcards
• Updated the way a flashcard info is written in the file (more concise). For now it has a retro compatibility
• Changed the name of YAML variable side1_desc to side1Desc to fit more to JS style
• Changed the name of YAML variable side2_desc to side2Desc to fit more to JS style
• On wrong, the card is not put at X place in the queue, but simply put back in the pool
• To pick a card, it is not a queue anymore, but only a pool from which cards are randomly selected
• When creating a card (with helper), the card has a level of -1 (ie is a new card). New cards are not integrated until end of current (or next) review)
• Not all new cards are integrated together. Only a certain number each time (see README.md for more details)
• Settings are reduced to minimum
• When a flashcard is malformed (because created manually) a flag is made visible, and a notification appears to be easier to spot in the vault