Now using modern CMake features as discussed by Daniel Pfeifer on C++Now 2017. Moreover a full build environment is defined by the provided [mini-cross](https://github.com/ooxi/mini-cross) description.

Squashed commit of the following:

commit 9ed7fee198
Author: ooxi <85fcd0ef4ec8@f977375cdcd6.anonbox.net>
Date:   Thu Nov 1 18:20:04 2012 +0100

    xml.c parser verbosity

commit 97d4cbade8
Author: ooxi <85fcd0ef4ec8@f977375cdcd6.anonbox.net>
Date:   Thu Nov 1 18:19:21 2012 +0100

    xml.c parser verbosity

commit 8c5493710b
Author: ooxi <85fcd0ef4ec8@f977375cdcd6.anonbox.net>
Date:   Thu Nov 1 18:17:13 2012 +0100

    xml.c parser verbosity

commit 3a793c8c7d
Author: ooxi <85fcd0ef4ec8@f977375cdcd6.anonbox.net>
Date:   Thu Nov 1 18:16:37 2012 +0100

    xml parser verbosity