new version

merged changes:

• type aliases for loading old files (tested by @isarris). You can now do string/regex substitution on typename strings in InPartS data files to load old files without having to define alias types. Use with caution, the implementation is VERY basic.
• better type promotion in domain constructor (!93 (merged))
• more boxgrid constructors (!89 (merged))
• bugfix in import codeblocks (!92 (merged))
• relaxed type restriction in memory backend because core uses it (!90 (merged))
• JLD2 compat bump (!95 (merged))
• removed some weird fallback definitions (!99 (merged))

pending:

• !90 (merged) somebody needs to test this
• @pbittih does the regex type alias thing make some of your more elaborate fallback code (legacyparams et al.) unnecessary? if yes we should maybe deprecate and remove it because every simplification of the export system is welcome
• !89 (merged) @jisense what's the status here? the MR is ancient but it has no description so I don't know what to do with it
• !57 looking for volunteers to adopt this (maybe @isarris since this might be relevant for you?)

none of this is urgent, the only reason this MR exists at all is because Ilias needed the regex type aliases yesterday so I decided to fix them up and merge them into dev