templatekw: use templatekeyword to mark a function as template keyword
Using decorator can localize changes for adding (or removing) a
template keyword function in source code.
This patch also removes leading ":KEYWORD:" part in help document of
each keywords, because using templatekeyword makes it useless.
For similarity to decorator introduced by subsequent patches, this
patch uses 'templatekeyword' instead of 'keyword' as a decorator name,
even though the former is a little redundant in 'templatekw.py'.
file name reason
=================== ================= ==================================
templatekw.py templatekeyword for similarity to others
templatefilters.py templatefilter 'filter' hides Python built-in one
templaters.py templatefunc 'func' is too generic
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