Support configurable validator bin path

[hey-researcher]

I'd like to compare my own validator binary with existing ones, so it would be nice to have configurable path to bin per validator.

[neodix42]

Please try v124, it has a new command line parameter now:

custom-binaries=absolute-path - used to start MyLocalTon with custom TON binaries. The folder should contain validator-engine, validator-engine-console, lite-client, fift, func, generate-random-id, create-state, dht-server, tonlibjson, blockchain-explorer binaries and also smartcont and lib folders in its root folder.