Added basic mod configuration

BUG Fix: Fixed an issue where damage numbers would disappear after continuing a run

Fixed issue with Ultra Famine, Ultra Pestilence and Hush flys

- Fixed issue where entities without healthbars still displayed damage numbers

- Fixed Sister Vis crashing the game with SpiderMod+ enabled

- Small performance fixes
- Flys and other 'parented' entities should correctly display their own health not the collective HP

- Fixed some regressions from the last version
- Crashes _shouldn't_ happen anymore
- Fixed Gemini not having healthbars in certain cases

- Fixed possible crash by checking if Entity
- Made it so various fly types correctly show healthbars

- Greedier would display without a health bar and damage bars when spawning
- Will no longer show damage numbers that are zero (blocked damage)

- Better handling of segmented enemies
- Ragman / Rag mega who respawn enemies now correctly display health bars