[FEATURE] Ability to check/uncheck optional dependencies at once

[PrivateN00b]

This PR adds a setting for situations where packages may have optional dependencies but you don't intend to see all these dependencies be checked on. The default value remains true.

Related issue: #346

Please inform me if I misunderstood the request in some way.

EDIT: I don't know either of the localized languages besides English, and most likely an AI-translated one would sound a bit weird.

[vinifmor]

Hi @NoobKozlegeny . Just tested your changes and they are fine (thank you). The only point I believe should be changed is the new property name (suggest_optdep_download) that refers to "downloading" and not the actual behavior (that is auto-selecting all optional dependencies). Perhaps, something like suggest_optdep_select ? (just a suggestion)

[PrivateN00b]

Thank you for the reply! Yeah, that could be arranged, but I will be a bit occupied until Wednesday, so don't merge this PR yet.

[PrivateN00b]

Hi @NoobKozlegeny . Just tested your changes and they are fine (thank you). The only point I believe should be changed is the new property name (suggest_optdep_download) that refers to "downloading" and not the actual behavior (that is auto-selecting all optional dependencies). Perhaps, something like suggest_optdep_select ? (just a suggestion)

@vinifmor Rename done :3