Fix legacy blocks resolving to air in Bedrock worlds#2440
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Worlds with blocks not converted by the 1.13 major update still have some old numeric id's, even when the world itself itself is a modern version
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This fixes an issue with legacy chunks not being fully upgraded, I had just upgraded a world from an old version (within Minecraft, not chunker) which still had legacy numeric id's, Which when converted to java in my case left air instead of the relevant blocks, this simply adds a check for legacy blocks, and when detected, falls back to the legacy resolver used for worlds before 1.13
It does this by looking for
valtags which only existed in legacy versions of the game (Legacy Console Edition, all pre 1.13 versions e.t.c.) and then defaults them to the legacy resolver