CMake: Fix #149.

Check for the definition of `_MSC_VER`, rather than its value.

Conflicts:
	c++/src/kj/common.h

Distinguishing between "local bugs" and "preconditions" was proving difficult in practice, because a precondition failure in one function may very well indicate a bug in a calling function, but the exception may be thrown through that function, thus when caught the classification is nonsensical. The distinction also was not as useful as imagined. So, I eliminated this distinction.

Add asBytes() and asChars() methods to array classes to reinterpret-cast to bytes / chars, since this happens all the time and is otherwise a huge pain.

Use the new methods in a bunch of places.

Add missing semicolon in Interfaces example

The project file still only compiles a test binary, but it should be easy to separate out a library project from here.

Thanks again to Bryan Boreham <bjboreham@gmail.com> for much help getting this working.

Fix Windows bug that doesn't happen under wine: stdin defaults to text mode, which of course breaks compiler plugins.

Thanks to Bryan Boreham <bjboreham@gmail.com> for much help getting this started.

This prevents the compiler from reporting warnings in these headers while compiling application code. Hopefully this will stem the never-ending stream of complaints from people who enable pedantic warnings.

Fix bug where EzRpcClient would segfault if the target host resolved to multiple addresses and the connection to the first of those failed.

kernel32.dll and msvcrt.dll are the only remaining dependencies.

Accommodate code for MSVC

Add __forceinline for MSVC