Added a bunch of measurement unit enums

Not sure why but i decided to work on these. I know i'll end up using
them but not sure why i decided to make them now.

Converted UE Eletrical Display into two separate classes for my use.
EletricUnit enum, and MeticUnit enum.

Added enums for force, pressure, temperature. Force is filled out but
not completed. As well each of these are missing more units but the main
ones are there.