Take an app's requests only with a token its tokens file grants (017, 3b)

An app given a tokens file (tokens=FILE in --apps, --tokens FILE for the
one app of a host) answers a request only when it bears a token
(Authorization: Bearer) whose SHA-256 the file lists with a grant: read
for its views, queries and documents, write for all, input=NAME for
those inputs alone; 401 unauthorized (WWW-Authenticate: Bearer) without
one, 403 forbidden past its grant. A delivery sealed by a key --sender
names needs none. The digests are compared in constant time; a
connection keeps its last token's digest, so the same token is hashed
once. SHA-256 is the host's own (serve/sha256.c), no OpenSSL loaded. A
reading puts a changed tokens file in place with the app running on; a
file that is not one stops the app. pure-serve --make-token GRANT makes
a token and its line. load takes PURE_LOAD_TOKEN.

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