Simplify font selection

[ahinterl]

I consider font management in Trilium as nearly unmanagable for the average user, so I'd like to see a font selector in the Trilium settings that's easy to handle:

• One row for the GUI font (the font used for GUI elements)
• Four rows for regular, bold, italics, and bold italics text in the client area of the editor (for example, the text in a text note)

Each row allows the mapping of a font file (either already installed and available in the OS, or uploaded individually) to a property (GUI, regular, bold, italics, bold italics). A simple dropdown list (maybe with "upload file..." at the top) would be nice. Needless to say that there must be an option to manage individually uploaded font files (delete, replace).