Initial community commit

Src/external_dependencies/openmpt-trunk/include/premake/website/docs/table.keys.md

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+Return an array of all keys used in a table.
+
+```lua
+table.keys(tbl)
+```
+
+### Parameters ###
+
+`tbl` is the table to be enumerated.
+
+
+### Return Value ###
+
+A new array containing all of the keys encountered in the table.
+
+
+### Availability ###
+
+Premake 5.0 or later.
+