[Freeciv-Dev] patch: allowconnect server option (PR#446)

[David Pfitzner <dwp@xxxxxxxxxxxxxx>]

This patch adds a server command 'allowconnect':

: > help allow
: Option: allowconnect  -  What connections are allowed
: Description:
:   This should be a string of characters, each of which specifies a type or
:   status of a civilization, or "player".  Clients will only be permitted to
:   connect to those players which match one of the specified letters.  This
:   only affects future connections, and existing connections are unchanged. 
:   The characters and their meanings are:
:       N = New players (only applies pre-game)
:       H = Human players (pre-existing)
:       A = AI players
:       D = Dead players
:       B = Barbarian players
:   Note that the first description from the _bottom_ which matches a player is
:   the one which applies, thus 'D' does not include Barbarians, 'A' does not
:   include dead AI players, and so on.  The case of the characters is not
:   significant.
: Status: changeable
: Value: "NHAD", Default: "NHAD"

Eg, this allows connecting to barbarians for testing, or disallowing
connections to dead players or AIs (may be connsidered cheating in some
cases), etc.  Disallowing N or H would be unusual, but there may be 
uses, eg with autotoggle and 'create' ?  But mainly they are there for
completeness...

Regards,
-- David

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