[Feature request] Add support for custom icon packs

[inson1]

Checklist

• I made sure that there are no existing issues - open or closed - to which I could contribute my information.
• I made sure that there are no existing discussions - open or closed - to which I could contribute my information.
• I have read the FAQs inside the app (Menu -> About -> FAQs) and my problem isn't listed.
• I have taken the time to fill in all the required details. I understand that the bug report will be dismissed otherwise.
• This issue contains only one feature request.
• I have read and understood the contribution guidelines.
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Feature description

like https://github.com/Arcticons-Team/Arcticons
many launchers support that (Arcticons-Team/Arcticons#1874)

Why do you want this feature?

So I can use custom icon pack

Additional information

SimpleMobileTools/Simple-App-Launcher#201

SimpleMobileTools/Simple-Launcher#30
SimpleMobileTools/Simple-Launcher#162

[inson1]

@Aga-C Is there reason why it needs triage? Or you didnt get to it yet? :)

[Aga-C]

@inson1 We haven't decided yet if we want to implement it.

[aloxe]

I quoted this feature request because I think this could resolve the user's issue on #47. Also, I mentioned that this feature is developed in the open source App KISS, although I am not sure Java code can help you in developing a feature in Kotlin.