Add error handling to iOS post editor (#210)

• Add error handling to post editor

• Cleanup

• Add error handling to macOS (#211)

• Add error handling to Mac app

• Log fatal errors and present alert on next launch (#212)

• Log fatal crashes and present alert on next launch

• Update crash alert copy and navigate to help forum

• Refactor logging into reuseable methods

• Refactor class to use protocol

• Clean up todo comment

• Revert "Log fatal errors and present alert on next launch (#212)"

This reverts commit 7475b577726faffec856dbdac4c69ed79501b972.