Recent SDL syntax updates (interfaces + filed/value/type lists + new type extentions)#337

Merged

OlegIlyenko merged 7 commits intomasterfrom 309-sdl-updates

Feb 7, 2018

+1,614-431

Commits on Feb 5, 2018

Commits on Feb 7, 2018

Added dangerous changes in the schema comparator. Closes #335
OlegIlyenko
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