screenshot (github top 50) and statistics charts support in website output

game engines now counted as frameworks
few additions

entries/screenshots/README.md

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+Screenshots are taken from the game websites themselves or from the games themselves,
+in that case no URL will be given. They are reduced in resolution to 128 pixel height and stored as jpg with
+compression factor 85, to save storage and because they are considered not very important for us. This file contains
+information about which game (use canonical name, i.e. the file name) has which screenshots with which resolutions.
+When the website is updated, the screenshots can be included at the right positions. The use of these screenshots is
+considered fair use and no special labeling is needed.
+
+# 2048
+
+01 103 128 https://cloud.githubusercontent.com/assets/1175750/8614312/280e5dc2-26f1-11e5-9f1f-5891c3ca8b26.png
+
+# craft
+
+01 171 128 https://i.imgur.com/SH7wcas.png
+
+# evil_cult
+
+01 213 128
+
+# mindustry
+
+01 282 128 https://mindustrygame.github.io/images/1.png
+02 288 128 https://mindustrygame.github.io/images/2.png
+03 290 128 https://mindustrygame.github.io/images/3.png
+
+# openra
+
+01 218 128
+02 219 128
+03 218 128
+
+# openrct2
+
+01 228 128 https://i.imgur.com/e7CK5Sc.png
+