Add Aspell support

I use joplin a lot to write several types of documents. and I think it would be a good idea to have support for spell checking, it would be possible to add support for aspell. Maybe similar to some internet browser does, underline the misspelled words and with the right click show the correction options


Hi and welcome on board;)

I would have suggested to use an external editor like typora but even if it has the spell check option, it doesn’t work for me (many french mistakes)