The main reason of this change is to place URLs and Git Tags of remote
dependencies at the top of CMakeLists.txt

Another outсome is that the user will be able to adjust these settings
easily.

Provide an example of how to copy non-source files into build
directory.

Automatic download of dependencies is considered to be the default
behavior when building the project according to README.md.

However, the automatic download is not enabled by default now due to
the mistake in syntax of option() command in CMakeLists.txt.

This commit fixes the bug.

Ignore files generated by Visual Studio.