Adjust grid headers to allow Ability to grow to fill space

[jazeee]

Summary

The Spell -> Ability column was a fixed width, and always wrapped the string.

The word "Ability" on the Arcane spellcasting tab never expands enough to show the whole word on one line:

Changes

• Make Ability column use fractional width
• Adjust other columns to fix width
• Change grid style to not break words, but rather to fill as much as they can in the header, without overflowing.
• Update shortened strings - Sph -> Sphere, and N -> Notes

Screenies

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