Change regex of health/damage/restoration amount
Don't delete unused object properties

This lets us use objects as associative arrays.
Added framework for migrating to later versions

This will fix issues for people upgrading from very old
versions, and allow more radical changes to internal data
structures.
Fix overview when migrating from version 4.x
Migrate to the new item system fully, and do it only once
Removed deprecated items and added monster food to the list of displayed items
Merge branch 'pushes' into logging
Replace drop tracking system
Fix a syntax error
Merge pull request #9 from m101010ax/pushes

Pushes
Merge from the branch 'develop-drops'
Add 'Happy Pills' to drops display list
Remove obsolete difficulties
Fix an accidental error that is added when resolving conflicts
Add HV Font text parser
Add supports of HV Font
Fix a regression of 'Warnings before starting Challenges'
Refactor 'inventoryWarning' and fix the position of warning icon
Integrate the role of `inventoryAlert` into `hvStat.characterStatus`
Refactor 'hvStat.database.openIndexedDB'