InboxView & MailListView improvements

Add .onDelete() functionality in MailListView to delete emails
Add attachment indicator in MailRow
Replace blue 🔵 emoji "read" indicator by greying out read mails in MailRow
Make search filter in InboxView default to "All"
Fix padding on Compose button in bottom navigation bar of InboxView

Edited Mar 25, 2021 by cruxfilm

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