(svn r15027) -Merge: tomatos and bananas left to be, here is NoAI for all to see.

NoAI is an API (a framework) to build your own AIs in. See:
   http://wiki.openttd.org/wiki/index.php/AI:Main_Page
 With many thanks to:
  - glx and Rubidium for their syncing, feedback and hard work
  - Yexo for his feedback, patches, and AIs which tested the system very deep
  - Morloth for his feedback and patches
  - TJIP for hosting a challenge which kept NoAI on track
  - All AI authors for testing our AI API, and all other people who helped in one way or another
-Remove: all old AIs and their cheats/hacks

src/ai/api/ai_gamesettings.cpp

@@ -0,0 +1,38 @@
+/* $Id$ */
+
+/** @file ai_gamesettings.cpp Implementation of AIGameSettings. */
+
+#include "ai_gamesettings.hpp"
+#include "../../settings_internal.h"
+#include "../../saveload/saveload.h"
+
+/* static */ bool AIGameSettings::IsValid(const char *setting)
+{
+	uint i;
+	const SettingDesc *sd = GetPatchFromName(setting, &i);
+	return sd != NULL && sd->desc.cmd != SDT_STRING;
+}
+
+/* static */ int32 AIGameSettings::GetValue(const char *setting)
+{
+	if (!IsValid(setting)) return -1;
+
+	uint i;
+	const SettingDesc *sd = GetPatchFromName(setting, &i);
+
+	void *ptr = GetVariableAddress(&_settings_game, &sd->save);
+	if (sd->desc.cmd == SDT_BOOLX) return *(bool*)ptr;
+
+	return (int32)ReadValue(ptr, sd->save.conv);
+}
+
+/* static */ bool AIGameSettings::IsDisabledVehicleType(AIVehicle::VehicleType vehicle_type)
+{
+	switch (vehicle_type) {
+		case AIVehicle::VEHICLE_RAIL:  return _settings_game.ai.ai_disable_veh_train;
+		case AIVehicle::VEHICLE_ROAD:  return _settings_game.ai.ai_disable_veh_roadveh;
+		case AIVehicle::VEHICLE_WATER: return _settings_game.ai.ai_disable_veh_ship;
+		case AIVehicle::VEHICLE_AIR:   return _settings_game.ai.ai_disable_veh_aircraft;
+		default:                       return true;
+	}
+}