Rework of current macro system (/variable command?)

Rework of the current 'variables' offered by macros. E.g. a new command (/variable)

Usage:

/variable [TYPE] [NAME] [SET/GET] [VALUE]
/variable [TYPE] [NAME] [SET/GET] [FROM] [ENTITY/STORAGE] [PATH] [optional:SCALE]

An example of this:

/variable boolean isAdmin set false
/variable get isAdmin

OUTPUT:
isAdmin is false

This could also work with 'execute store' and would allow for an easier, better and more free use of variables