Enhancement: Clean up the code-base for DML and KINP

[Joshsora]

A list of things I want to come back to after finishing the ObjectProperty system.

• Switch from tabs to 4 spaces.
• Combine ki::dml::runtime_error and ki::protocol::runtime_error.
• Create more descriptive exception types and determine when each of them is appropriate.
• Use ki::BitStream instead of std::stream in ki::dml and ki::protocol.
• Modularize ki::protocol::net::Session.
• Remove the triangle inheritance in ki::protocol::net.
• Use instance-owned receive/send buffers instead of allocating buffers for every message.
• Choose a C++ documentation generator and document everything.
• Write in-depth tests. Strive for 80%+ coverage.
• Make ki::protocol::net and ki::protocol::control non-dependant on ki::dml.
• Pass strings by constant reference.
• Make parameters constant if possible.
• Consider thread-safety.
• Look into using C++ smart pointers.
• Use C++ style casting.