Execute require inside MetaScript context

[tshemsedinov]

Now if we load module inside MetaScript and pass require to it's context so module can load another module, this require will be executed in the global context of all application, not in internal MetaScript context. We need special require implementation to be executed inside MetaScript context.

[tshemsedinov]

@AliusDieMorietur #58 landed but I'll close this issue after internal module nested require and commonjs cache implemented. Also need more tests for permissions. I hope will do that next week.

[tshemsedinov]

Main feature we need is loading npm packages in sandboxes with support of sandboxing nesting