(!1152) Blight rework

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Description

1. Reduced BW hearth healing from 30 to 15.
2. Blight cannot be countered by BW hearths or wells
3. Blight cannot be countered by CB
4. Troops stepping into Blight land "catch" plague for 30 seconds, most likely leading to death.
5. The closer to the center, the more deadlier the effect.
6. If a unit dies, it releases auxiliary plague damage, which lasts another 20 seconds.
7. Troops with plague spread it to other troops if they come into contact, and if these newly exposed units die, they release more plague and become infectious themselves.

 

Checklist

I have:

• Tagged my change with the ;,; comment block.
• Ensured that this merge request changes exactly one thing.
• Attached the proper labels to this merge request.
• Added the Merge Request number in the title. e.g. (!42)
• Added a devlog entry for this change.
• Tested my code.