[#2234] Use QueryStringDecoder.decodeComponent to decode url-encoded data instead of Java's URLDecoder.

Motivation:
Previously, we used URLDecoder.decode(...) to decode url-encoded data. This generates a lot of garbage and takes a considerable amount of time.

Modifications:
Replace URLDecoder.decode(...) with QueryStringDecoder.decodeComponent(...)

Result:
Less garbage to GC and faster decode processing.
Make sure the local / remote InetSocketAddres can be obtained. Part of [#2262]

Motivation:
Make sure the remote/local InetSocketAddress can be obtained correctly

Modifications:
Set the remote/local InetSocketAddress after a bind/connect operation was performed

Result:
It is possible to still access the informations even after the fd became invalid. This mirror the behaviour of NIO.
Allow specifying `SelectorProvider` when constructing an NIO channel #2311

Motivation:

At the moment we use the system-wide default selector provider for this invocation of the Java virtual machine when constructing a new NIO channel, which makes using an alternative SelectorProvider practically useless.
This change allows user specify his/her preferred SelectorProvider.

Modifications:

Add SelectorProvider as a param for current `private static *Channel newSocket` method of NioSocketChannel, NioServerSocketChannel and NioDatagramChannel.
Change default constructors of NioSocketChannel, NioServerSocketChannel and NioDatagramChannel to use DEFAULT_SELECTOR_PROVIDER when calling newSocket(SelectorProvider).
Add new constructors for NioSocketChannel, NioServerSocketChannel and NioDatagramChannel which allow user specify his/her preferred SelectorProvider.

Result:

Now users can specify his/her preferred SelectorProvider when constructing an NIO channel.