[feature] Support pre-1.2.0 alphas

[KaiSandstrom]

I see that with the most recent version of AMIDST, functionality has been extended to the old biome system from Alpha 1.2.0 through Beta 1.7.3. This is great to see! I remember this being a feature in an outdated experimental branch, and I was wondering if it would ever make its way into the full program. I'm glad it has!

Could support perhaps be extended to versions from before Alpha 1.2.0 as well? I understand that since these early versions lacked a biome system, the map would only really show the divisions between terrain and ocean, but this would still be useful for showing the changes in terrain generation between versions over the years. In particular I'd like to be able to easily visualize the changes made to continent shapes between a1.1.2 and a1.2.0 aside from the addition of biomes. I think the terrain generation immediately before Alpha 1.2.0 existed from inf-20100611 through Alpha 1.1.2_01. Perhaps monoliths could be shown as a third "biome"? They're caused by errors in the noisemap after all, so they shouldn't be hard to find in the continent-mapping process.

Perhaps this is is a long shot, but being able to visualize the terrain in infdev versions between inf-20100327 and inf-20100608 would be a nice treat as well, although tbh I don't know much about how the old Minecraft terrain generation code worked -- perhaps adding support for versions up to a1.1.2_01 would work for these as well without too much extra effort.