Run on multiple files of the project

[pesho-ivanov]

Is your feature request related to a problem? Please describe.
I expect to get a list of all spelling errors in my project (an academic paper) so that I can be sure I do not miss any.

Describe the solution you'd like
I would expect that the ltex runs on all files in my project (or on a glob) so that I can go through the list of reported Infos events.

Describe alternatives you've considered
Opening all files manually in order for ltex to run on them.