Strict API

[aristov]

Strict API prevents user to use incompatible parts of API together. It throws exceptions when user try to

• change permanent mod on runtime
• use BEMJSON special field without compatible or with incompatible mod
• use public methods with wrong arguments

From discussions on working meetings with @veged @dfilatov @narqo.

[aristov]

Think how to omit these checks in production mode.