feat: explicit units for numbers

[zackbrown]

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[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

[jnlsn]

@zackbrown I'm curious what you have in mind for this. I've been thinking some additional .diezrc config would be cool for specifying what unit you prefer by default (rem or px). Maybe even an option to set the default rem to something other than 16 when calculating values? Just spitballing here, but it might also be nice to have a generic spacing / sizing / unit prefab? Generic strings may cover that use case but I was thinking it could be useful to be able to specify a unit in px values like scale01: Unit.px(24) and then get the rem calculated result as scale01.rem or scale01.px. Only rem or px would output in scss/css depending on your diezrc preference.