Feet to Meter support

[Dany-Deaneris]

When metric system is used, spell still use imperial

And small, medium and long range for spell is calculated in feet also, and would need to be in metric as well

small (7,50 m +1,50 m / 2 level)
medium (30 m + 3 m/ level) long (120 m + 12 m/ level)

[Dany-Deaneris]

walk speed is also in feet

[red5h4d0w]

I'm working on implementing something along those lines see #146 where I tackle automatic weight conversion.

[K484L-v1]

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