Override Detected Configuration

[jroddev]

Add the ability to override the what is auto-detected by the app such as:

• Repository type: GitHub, GitLab, Gitea, etc
• Package Name
• Icon Locations
• Default Branch
• Android Root or build.gradle location
• Release number source - releases name or tag_name, custom regex

This will allow supporting non-standard repository/app structures and help with https://github.com/jroddev/android-oss-release-tracker/issues/5 by caching more info at configuration time.

Off the top of my head this involves:

• Changing the save/load logic to be a JSON array+objects instead of just a list of URLs.
• Change UI logic to use cached vlaues instead of making API calls.
• Adding new UI to allow the user to configure new repos (and edit existing?)
• Add UI for bulk import of URL list (are people actually using this feature?)