Replaced msgpack implementation

[igorkorsukov]

For msgpack I first took a third-party implementation (https://github.com/mikeloomisgg/cppack). I liked it, simple, clear, easy to use.
But the experience of use showed some problems:

• floats from -1 to 1 were not packed correctly (there is a PR that fixes this, but the author does not merge it fix: unpack failed when value between -1.0 to 1.0 mikeloomisgg/cppack#17)
• It is inconvenient to add packing/unpacking functions for your types; we need to modify the type itself.
• Not very efficiently implemented, temporary buffers are often created and then copied

This is a new implementation, a completely different implementation for each type (especially differences for float and double), and a slightly different design, more flexible and efficient.