made fixes for really broken but readable files.#32

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mlaukala wants to merge 5 commits intoempira:masterfrom

FeichtnerDataGroup:bad_offsets

Commits on Nov 6, 2017

Commits on Nov 8, 2017

Fixed a function that checks if the current lexer.position is inside of a stream
mlaukala
committed

Commits on Nov 14, 2017

IsValidXref() no will no longer check if it's inside of a stream beyong an EOF symbol.
mlaukala
committed

Commits on Dec 11, 2017

Fixed IsValidRef(). Made bad checks.
mlaukala
committed