Could we rename MetaContainer to MetaFile?

[falexwolf]

And then write a sentence of two how MetaStore allows to modify MetaFile in memory, but then has to write these changes back in case the file should update?

An alternative name for MetaFile could be MetaJSON or MetaDict to express the low-level nature of it?

I'm not a big fan of container as it's sooo generic and applies to all Meta classes.

[Koncopd]

I am not sure, MetaJSON implies it is JSON, and it is not. Same for MetaDict.