Move all struct and typedefs to separate header#13

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LuxoftAKutsan wants to merge 2 commits intosmartdevicelink:masterfrom

LuxoftAKutsan:fix/fix_compilation_for_gcc4.4.2

Commits on Mar 1, 2018

Move all struct and typedefs to separate header
LuxoftAKutsan
committed

Commits on Mar 6, 2018

Rename bson_fwd -> bson_common
LuxoftAKutsan
committed