No Static Linking

No longer linking statically against libgcc and libstdc++.
GCC 4.8.1

Moved to compiling the server with GCC 4.8.1 on Windows.

Accordingly I can now take advantage of the [[noreturn]] standard C++ attribute rather than the GCC-specific __attribute__((noreturn)).

I was hoping GCC 4.8.1 would fix the bug preventing me from deducing the minimum necessary alignment for Variant's internal byte buffer (GCC rejects the constexpr value in the template as not being a constant for the purposes of alignas) but apparently that fix isn't in 4.8.1.  Maybe 4.9.
Packet Serialization Performance Improvement

Removed an unnecessary heap operation in some cases by using only one buffer to build a packet, rather than two (bytes are now moved back and the length header is inserted before them, rather than all serialized bytes being copied into a new buffer behind the length header).