Remove type fallback from datagen

[robertbastian]

Falling back from the generic to the standard display name for the generic format in datagen means the standard display name will be included in both generic and specific data structs.

This introduces a second "generic standard" data struct that contains generic names that are actually standard. This data struct is used by both the generic and the specific format.

metazone/generic/names/long/v1, <total>, 614'187B, 596'865B, -> 324'780B, 309'490B
metazone/generic/standard/names/long/v1, <total>, 0B, 0B -> 290'413B, 273'641B
metazone/specific/names/long/v1, <total>, 1'342'950B, 1'325'847B, -> 996'922B, 977'516B
    
This means:
* generic format: 614'187B, 596'865B -> 615'193B, 598'421B
* specficic format: 1'342'950B, 1'325'847B -> 1'287'335B, 1'251'157B
* both formats: 1'957'137B, 1'922'712B -> 1'612'115B, 1'560'647B

[sffc]

A bit annoying that you need to check extra data structs to get the name you need, but the size win is compelling.

I can follow the fallback chain when it is illustrated.

Seems likely that bugs will arise with all this fallbacking; make sure it is well tested.