Decouple server from driver

[uuf6429]

The main objective is to decrease installation requirements and load of the current package by making using of a compiled executable server.

Definite action points

• Move electron server stuff to MinkElectronServer repository
• Move npm bridge to require-dev in composer
• Add MinkElectronServer to require-dev in composer
• MinkElectronServer should be built by something like electron-packager (how to) and binaries stored in GitHub release

Unclear/risky action points

• MinkElectronDriver should know where to find the server executable:
  • for dev, from vendor/MinkElectronServer/... (the current electron+js etc path)
  • for prod, from vendor/bin (the path where MinkElectronServerPrebuilt puts the exe) we may have to do some fun to find the OS-dependent exe name
• CI tool runs for MinkElectronServer should publish executables to repository releases
• A composer installer package that installs executables from MinkElectronServer releases depending on OS

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Repository	Contents	Purpose
MinkElectronDriver	Composer package with driver and extension used by Mink & Behat	Used in Mink / Behat BDD projects
MinkElectronServer	Composer package with server source code	- Not used directly except for development - CI/D stores builds in GitHub releases - Requires Node.js+Electron+Electron-Packager
MinkElectronServerPrebuilt	Composer binary installer	Installs prebuilt MinkElectronServer binary depending on OS