Version of OpenTTD

As of 20191023-master-g0d1575b5c7

Expected result

The following error messages should be mapped to the corresponding values (subject to change):

• "Tree planting limit reached" -> ERR_LIMIT_REACHED
• "Tile clearing limit reached" -> ERR_LIMIT_REACHED
• "Landscaping limit reached" -> ERR_LIMIT_REACHED
• "Tree already here" -> ERR_ALREADY_BUILT
• "{TOWN} local authority refuses permission for airport due to noise concerns" -> (see comment)

Edit: update mappings from @glx22's commit.

When these error messages occur, the suggested action is to wait and retry, for example ScriptController.Sleep(10); ScriptTile.PlantTree(tile).

Actual result

The above error messages are not mapped.

Steps to reproduce

1. Lower the values of tree_per_64k_frames and tree_frame_burst below their defaults.
2. Increase "Construction speed" for AIs to "Very Fast".
3. Start an AI with the following code in Start() (see below).
4. Unpause and fast-forward the game.
5. After a while, you will initially see streaks of no trees at all, and then on top of that, the average number of new trees per tile will start to drop from 4. When this happens, the AI will output a bunch of ERR_UNKNOWN to the log instead of for example ERR_LIMIT_REACHED or ERR_ALREADY_BUILT.

local trees = 0;
local tile = 0;
local passes = 0;
while (true) {
	for (tile = 0; tile < AIMap.GetMapSize(); tile++) {
		if (AITile.PlantTree(tile)) trees++;
		if (AITile.PlantTree(tile)) trees++;
		if (AITile.PlantTree(tile)) trees++;
		if (AITile.PlantTree(tile)) trees++;
		AILog.Info("Pass "+passes+", Tile "+tile+" ("+AIMap.GetTileX(tile)+", "+AIMap.GetTileY(tile)+") - Trees: "+trees+" / 20000000 - Error: "+AIError.GetLastErrorString());
	}
	passes++;
}