K 10
svn:author
V 8
sveinung
K 8
svn:date
V 27
2015-08-28T10:54:21.282456Z
K 7
svn:log
V 537
JSON protocol: support URI encoded strings

Freeciv-web escapes some, but not all, strings using URI encoding.

Introduce a new dataio type estring. In the JSON protocol the estring is an
URI encoded string. In the raw protocol it forwards to the string dataio
type without encoding anything at all. Should the need to escape something,
like the C string terminator, appear a raw protocol implementation can be
added later.

Thanks to Andreas Røsdal <andreasr> for pointing out that CURL does URI
encoding and decoding.

See patch #6295
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