Select multiple files at once in Downloads tab

[sibir-ine]

Is your feature request related to a problem? Please describe.
Unlike most other tabs (e.g. Plugins, Data, Saves), users aren't able to select multiple files at once in the Downloads tab i.e. to delete or install multiple files at a time.

Describe the solution you'd like
It'd be convenient for users to be able to shift-click to select a list of mods & control-click to select multiple mods.

Describe alternatives you've considered
Users can always open the Downloads folder & select multiple files, but it'd be convenient to be able to do it within MO2. Users wouldn't have to worry about .meta files that way as well.

[isanae]

Duplicate of #725.