Feature request: Add support for custom damage formulas.

[Sanders47]

The current implementation of the damage system only allows for a fixed set of damage formulas (1d4, 1d6, 1d8, 1d10, 1d12). This limitation restricts the customization and flexibility of creating unique weapon types with different damage formulas.

I propose the addition of support for custom damage formulas. This would enable users to create and implement unique weapon types with varied damage formulas such as 2d4, 2d6, 1d6x etc