Add Mediaberry

hexaheximalrequested to merge
mediaberry/pmaports:add-mediaberry into master

This MR adds the boilerplate packaging needed for Mediaberry.

mbrt and sysapps are not included in this MR because Alpine Linux does not (yet?) package CEF.

For transparency: The packages here are based on the code from https://codeberg.org/lasagna/lasagna-pmaports.

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