Block Model Generation, data generation for custom blocks via blockstates.

[Fellteros]

A guide to block model generation and to data generation for custom blocks. I also added a new page for Item Model Generation, which is unfinished for now, because I don't have enough experience with that. Feel free to expand that.
The page should have not any spelling/grammar mistakes, though English isn't my main language. Some choices of words may be a little strange.

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[Fellteros]

thanks for the contribution! left a few comments here and there. you don't have to rehash what's in other articles, can just link to them ^^

All files should be changed according to your suggestions. I also added you to the author list.

[IMB11]

Quite alot of changes needed, very well structured so far.

The BlockFamily should be referenced/code shown in the page, its not mentioned enough.

Also run a quick spell check and grammar using LanguageTool, please dont use line break HTML elements either, a new line gap can suffice in all cases.

[Fellteros]

All changes should be present, thanks for all corrections.

[Fellteros]

All things should be complete now (I hope)