Env-var setup, out-of-sync check, statically linked binary

• Improved healthcheck for liteservers in multiclient: out-of-synced LSs are turned off automatically
• Added support for env-variables setup for quick setup:
  • Configuration now may be performed via environment variables
  • TON network config may be passed as a link to external resource (http/https)
• Binary now is statically linked. This decreases docker image size
• Changed name of parameter in getConfigParam to correspond to TL schema, with preserving of backward compatibility