Addition of a build system generator

[elfring]

I suggest to reuse a higher level build system so that powerful checks for software features will become easier.

• CMake
• Autotools

[vmxdev]

We are trying to keep it as simple as possible. In fact there is only one file to compile - "tkvdb.c". Files from "impl" directory are included in it more than once with different preprocessor defines. Is there reasons to complicate it?

[elfring]

• Does a tool like “autoscan” show any software dependencies that you find worth for further considerations?
• How do you think about to support more development environments by the reuse of build system generators?

[vmxdev]

Don't think it's really needed (at least for now).

However, I will not close this issue. If someone really needs it and will write build script (using build system should be optional, with the ability to bypass it), we will accept the pull request