docs/builtins: Enumerate all builtin functions implemented.

Based on unix version. No descriptions so far.

docs/library/builtins.rst

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+Builtin Functions
+=================
+
+All builtin functions are described here. They are alse available via
+``builtins`` module.
+
+.. function:: abs()
+
+.. function:: all()
+
+.. function:: any()
+
+.. function:: bin()
+
+.. class:: bool()
+
+.. class:: bytearray()
+
+.. class:: bytes()
+
+.. function:: callable()
+
+.. function:: chr()
+
+.. function:: classmethod()
+
+.. function:: compile()
+
+.. class:: complex()
+
+.. class:: dict()
+
+.. function:: dir()
+
+.. function:: divmod()
+
+.. function:: enumerate()
+
+.. function:: eval()
+
+.. function:: exec()
+
+.. function:: filter()
+
+.. class:: float()
+
+.. class:: frozenset()
+
+.. function:: getattr()
+
+.. function:: globals()
+
+.. function:: hasattr()
+
+.. function:: hash()
+
+.. function:: hex()
+
+.. function:: id()
+
+.. function:: input()
+
+.. class:: int()
+
+.. function:: isinstance()
+
+.. function:: issubclass()
+
+.. function:: iter()
+
+.. function:: len()
+
+.. class:: list()
+
+.. function:: locals()
+
+.. function:: map()
+
+.. function:: max()
+
+.. class:: memoryview()
+
+.. function:: min()
+
+.. function:: next()
+
+.. class:: object()
+
+.. function:: oct()
+
+.. function:: open()
+
+.. function:: ord()
+
+.. function:: pow()
+
+.. function:: print()
+
+.. function:: property()
+
+.. function:: range()
+
+.. function:: repr()
+
+.. function:: reversed()
+
+.. function:: round()
+
+.. class:: set()
+
+.. function:: setattr()
+
+.. function:: sorted()
+
+.. function:: staticmethod()
+
+.. class:: str()
+
+.. function:: sum()
+
+.. function:: super()
+
+.. class:: tuple()
+
+.. function:: type()
+
+.. function:: zip()