Flutter version bump

Updated flutter versions, rebuilt for new deps, etc

Minor updates

Minor tweaks

Clean up

Changes:

• Code clean up

Manually change an app's icon

Changes:

• User can now manually change an app's icon
• Fix for bogus apps being saved into database

Icon refresh fix, state retention, clean up

Changes:

• Switching icon packs now properly refreshes app list when cache is rebuilt
• Switching between preference screens no longer rebuilds the entire widget
• Flattened widget hierarchy, removed redundant styles

Icon pack support

Changes:

• Icon pack support
• Fixed nested scroll (landscape, smaller devices)
• Fixed blacklist icon offset issue

Pinned app placement setting

Changes:

• Choose either the right or left side to stick pinned apps

Notification icon size preference

Changes:

• Choose between small, medium & large icon sizes

Rework how notifications/stats are built on preference/page changes

Changes:

• Notifications/stats are now rebuilt on a background thread and update the notification directly from the mainactivity instead of the job. Should make page switching and preference changes more reliable

Tweaks to notification refresh policies

Changes:

• Settings update notification immediately
• Smarter policies for app stat rebuilds