[Rel. 1] Mutable Web. B.O.S-Gateway patch

[alsakhaev]

Demo: https://social.dapplets.org

Changes:

1. Add new dependency mutable-web-engine - the Mutable Web Engine. Starts on gateway start.
2. Add Mutation switch in the upper gateway panel.
3. Features enableComponentPropsDataKey, enableComponentSrcDataKey activated for Parser.
4. Webpack Config: deps styled-components and near-social-vm are reused in mutable-web-engine

ToDo before the merge:

1. Merge the PR for B.O.S-VM first!
2. Replace the forked dep near-social-vm with the dep to the original B.O.S-VM after PR-1 applied.
3. Switch off the flag skipTxConfirmationPopup, if needed