[boost] Use C++11 stdlib classes instead of boost.

[salkinium]

Trying to reduce the dependence on boost for xpcc for #316 (comment).

However, we use Boost.Asio for xpcc::hosted::SerialPort and there is no replacement in the stdlib for that. So I don't think we can get rid of all of boost.

In addition there is no replacement for boost::this_thread::disable_interruption, which breaks the API at the moment.

cc @strongly-typed @dergraaf

[emgre]

If you don't want to depend on boost for serial stuff, you can use the standalone Asio library : https://think-async.com/Asio/AsioStandalone

[salkinium]

In addition there is no replacement for boost::this_thread::disable_interruption, which breaks the API at the moment.

Never mind, std::thread is not interruptible anyways, so I just made this an empty class.

If you don't want to depend on boost for serial stuff, you can use the standalone Asio library

Great! That will remove our need for all of boost for hosted. I'll refactor it later.

[salkinium]

cc @dergraaf Please review these changes, since you wrote most of the affected code. The stdlib changes are based on boost anyways, so this is basically just a fancy find/replace, but please confirm that I implemented xpcc::rtos::Thread::Lock correctly!