Increase verbosity for 'openage --version'

We give the following information.
Output (updated 04/05/2020):

openage v0.4.0-131-ga3d99602b [devmode]
inotify, opengl, ci-cfg NOT SET
GNU 7.5.0 [ -fdiagnostics-color=auto]

== Python ==
Python        3.6.9 (default, Nov  7 2019, 10:44:02)
[GCC 8.3.0]
Python C API  1013
Cython        0.26.1
Jinja2        2.10
NumPy         1.13.3
Pillow        5.1.0
Pygments      2.2.0

== C++ ==
Eigen         3.3.4
Harfbuzz      1.7.2
Qt            5.9.5
SDL-runtime   2.0.8
libc-compile  2.27
libc-runtime  2.27
nyan

Windows

openage v0.4.0-141-g20640dba [devmode]
opengl, ci-cfg NOT SET
MSVC 19.25.28614.0 [/DWIN32 /D_WINDOWS /W3 /GR /EHsc /MP]

== Python ==
Python        3.7.7 (tags/v3.7.7:d7c567b08f, Mar 10 2020, 10:41:24) [MSC v.1900 64 bit (AMD64)]
Python C API  1013
Cython        0.29.17
Jinja2        2.11.2
NumPy         1.18.3
Pillow        7.1.2
Pygments      2.6.1

== C++ ==
Eigen 3.3.7
Harfbuzz 2.5.3
OpenGL 4.4.0 - Build 21.20.16.4574
Opus unknown
Qt 5.12.8
SDL-runtime 2.0.12
libc-runtime Windows
nyan

For future debugging on the user side we could give more information:

• libc
• sdl-version
• Qt-version
• eigen
• harfbuzz
• version numbers of python determined during compile time
• python packages version
• numpy
• python imaging library (PIL)
• OpenGL version number (create new context -> epoxy_gl_version() ?)
• nyan version number
• opus(file) version (doesn't seem to give version output on win builds for now) - FIX needed
• embedded python version (packaging)

Open for discussion:

• cmake version
• libpng
• Freetype
• ZLIB
• PNG
• SDL2Image
• Opus (doesn't seem to give version output on win builds for now) - FIX needed
• Ogg

Optional:

• GCCBacktrace
• gperftools-profiler
• gperftools-tcmalloc
• ncurses
• vulkan

In addition:
jj quote:

for all I care, the versions of every single thing that we have and that has a version.

For sure these all are information we can reuse when it comes to error reporting, #1172.

Categories
We could sort them into sections for:

internal modules (converter, nyan-lib, etc.), (soon)
python section (interpreter, packages/modules)
c++ libraries and alike
_data format versions (like nyan file, asset/modpack version, etc.) (soon)

Start from the openage --version entry point and compare its current output with the requested information and category lists in the issue. Determine which additional version details can be reported across Python, C++, and platform dependencies, then verify the command produces the agreed sections and values on supported platforms.