Extend statistics in the repository

[Trilarion]

Separate games from frameworks/libraries/tools. Don't forget to wipe the whole statistics directory each time.

• State with links to mature, beta, inactive, not inactive
• Languages with links to top languages (>1% usage)
• Code licenses with links to top licenses (>2% usage)
• Keywords (combine multiplayer, inspired by…) stop<0.5% link to all main categories and the most important
• extra page for entries without download or play field
• extra page for entries without code repository or not on popular site (GitHub, GitLab, BitBucket)
• Code dependencies with links to top dependencies (>0.1%)
• Build system with links to top build systems (>1%)
• extra page for C/C++ projects without build system (or without CMake)
• Platform with links (already exist just need to link)
• Developers with links to developers
• Originals with links to original

[Trilarion]

• Repositories on Github, GitLab, Bitbucket, SF, others ...

[Trilarion]

• Open, commercial content
• Multiplayer

[Trilarion]

There are output targets for stats

• md files for reading within the repository
• html files within the static page (see #134)

I also want to add svg diagrams and include them.