Support British imperial measurements

[mik3y]

Per request:

1/3rd pint
1/2 pint
1 pint (568.26ml/19.2 Us Oz)
8pints = 1 Gallon

4.5 gallons = 1 pin
2 pins = 1 firkin
2 firkins = 1 kilderkin
2 kilderkins = 1 barrel

A couple of other metric sizes for kegs are useful too:

5 Liters (Minikeg) (9 imperial pints approx)
10 Liters (Bag in Box Cider/Real Ale) (17.imperial pints approx)
20 Liters (Bag in Box Cider/Real Ale) (38 imperial pints approx)
30 Liters Euro Keg (54 imperial pints approx)
50 Liters (88 imperial pints approx)

[github-actions]

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