TODO
    Options:
        Automatic library management
            Auto deletion
            Recursive file addition
            Add only one file type if multiple are present
        Remember files
        Check files (hashes) upon restart
        Show what on startup
        Draw shadows
    Library:
        ✓ sqlite3 for cover images cache
        ✓ sqlite3 for storing metadata
        ✓ Drop down for SortBy
        ✓ Image delegates
        ✓ Image reflow
        ✓ Search bar in toolbar
        ✓ Shift focus to the tab that has the book open
        ✓ Tie file deletion and tab closing to model updates
        ✓ Create separate thread for parser - Show progress in main window
        ? Create emblem per filetype
        Table view
        Ignore a / the / numbers for sorting purposes
        Put the path in the scope of the search
            maybe as a type: switch
        Mass tagging
        Information dialog widget
        Context menu: Cache, Read, Edit database, delete, Mark read/unread
        Set focus to newly added file
    Reading:
        ✓ Drop down for TOC
        ✓ Override the keypress event of the textedit
        ✓ Use format* icons for toolbar buttons
        ✓ Implement book view settings with a(nother) toolbar
        ✓ Substitute textedit for another widget
        ✓ Theming
        ✓ Keep fontsize and margins consistent - Let page increase in length
        ✓ Fullscreening
        ✓ Remember open tabs
        ✓ Selectable background color for QGraphicsView
        ✓ View modes for QGraphicsView
        ✓ View and hide toolbar actions in a list
        Graphical themes
        Comic view keyboard shortcuts
        Record progress
        Pagination
        Set context menu for definitions and the like
    Filetypes:
        ✓ cbz, cbr support
            ✓ Keep font settings enabled but only for background color
            Cache next and previous images
        epub support
        mobi, azw support
        txt, doc, djvu, fb2 support
        ? Plugin system for parsers
        ? pdf support
    Internet:
        Goodreads API: Ratings, Read, Recommendations
        Get ISBN using python-isbnlib
    Other:
        ✓ Define every widget in code
        ✓ Include icons for emblems