Merged features for # 1.6.3 (#114)

- Added shift+click function for multi row selection to Dashboard
- Added -DBUILD_STATIC=ON/OFF option to CMake configuration to create fully static builds
- Added current algo and list of supported_varaints to login message for future usage on proxy
- Added support for latest Stellite (XTL) and Alloy (XAO) variants
- Simplification of configuration, "force-pow-variant" and "cryptonight-lite-ipbc" parameters are now deprecated see [Coin Configuration](https://github.com/Bendr0id/xmrigCC/wiki/Coin-configurations) for guidance
- Fixed leaks in transport shutdown

src/net/BoostConnection.h

@@ -71,10 +71,14 @@ public:
     {
         if (isConnected()) {
             LOG_DEBUG("[%s:%d] Disconnecting", getConnectedIp().c_str(), getConnectedPort());
+
+            boost::system::error_code ec;
+            socket_.get().lowest_layer().shutdown(boost::asio::ip::tcp::socket::shutdown_both, ec);
             socket_.get().lowest_layer().close();
         }
 
         ioService_.stop();
+        ioService_.reset();
     }
 
     bool isConnected() const override