[Freeciv-Dev] (PR#14226) Allow_Activity effect

["Mateusz Stefek" <mstefek@xxxxxxxxx>]

<URL: http://bugs.freeciv.org/Ticket/Display.html?id=14226 >

This patch introduces new effect "Allow_Activity". The effect replaces
the logic of TF_BRIDGE, TF_RAILROAD, TF_FORTRESS and TF_AIRBASE tech flags.
(TF_FARMLAND will be next).

This is done by adding new requirement target "ActivityType". 
The effect targets it's requirements on tile, player and unit.
Currently "road", "railroad", "fortress" and "airbase" activities are
supported.

Part of the effects.ruleset file:

[effect_can_build_roads_on_default]
name    = "Allow_Activity"
value   = 1
reqs    =
    { "type", "name", "range"
      "ActivityType", "Road", "Local"
      "UnitFlag", "Settlers", "Local"
    }

[effect_cannot_build_roads_on_rivers]
name    = "Allow_Activity"
value   = -1
reqs    =
    { "type", "name", "range"
      "ActivityType", "Road", "Local"
      "Special", "River", "local"
    }

[effect_bridge_building]
name    = "Allow_Activity"
value   = 1
reqs    =
    { "type", "name", "range"
      "ActivityType", "Road", "Local"
      "UnitFlag", "Settlers", "Local"
      "Tech", "Bridge Building", "Player"
    }

[effect_allow_railroad]
name    = "Allow_Activity"
value   = 1
reqs    =
    { "type", "name", "range"
      "ActivityType", "RailRoad", "Local"
      "UnitFlag", "Settlers", "Local"
      "Tech", "Railroad", "Player"
    }

--
mateusz

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