Add workplaces support.

Places:
Workplaces are now usable nodes.
Plotmarkers around a building can be scanned and their information stored into current plotmarker.
Slightly optimize plotmarker search.
Occupations:
Add test "priest" occupation definition.
Fix lots of bugs in initialization code.
Spawner:
Add ability to determine occupation name out of surrounding workplaces.
Assign occupation to spawned NPC using simple algorithm.
Others:
Reduce log noise a bit.
Fix some warnings.

data/occupations_data.lua

@@ -1,24 +1,28 @@
 -- Occupations definitions
 
 -- Register default occupation
-npc.occupations.register_occupation("default_basic", npc.occupations.basic_def)
+npc.occupations.register_occupation(npc.occupations.basic_name, npc.occupations.basic_def)
 
 -- Test priest
 npc.occupations.register_occupation("test_priest", {
 	dialogues = {
-		{
-			text = "How are you today my child?",
-			tags = "male"
+		type = "given",
+		data = {
+			{
+				text = "How are you today my child?",
+				tags = {"male"}
+			}
 		}
 	},
 	textures = {
 		"npc_male_priest.png"
 	},
 	initial_inventory = {
-		"farming:bread 1"
+		{name="farming:bread", count=1}
 	},
+	initial_trader_status = npc.trade.NONE,
 	building_types = {
-		"home"
+		"hut", "house", "farm_tiny", "lumberjack"
 	},
 	surrounding_building_types = {
 		"church"
@@ -28,63 +32,63 @@ npc.occupations.register_occupation("test_priest", {
 
 -- Test farmer
 npc.occupations.register_occupation("test_farmer", {
-		dialogues = {},
-		textures = {},
-		initial_inventory = {},
-		schedule_entries = {
-			[7] = {
-				[1] = 
+	dialogues = {},
+	textures = {},
+	initial_inventory = {},
+	schedule_entries = {
+		[7] = {
+			[1] =
+			{
+				task = npc.actions.cmd.WALK_TO_POS,
+				args = {
+					end_pos = npc.places.PLACE_TYPE.OTHER.HOME_OUTSIDE,
+					walkable = {}
+				}
+			},
+			[2] =
+			{
+				check = true,
+				range = 2,
+				random_execution_times = true,
+				min_count = 10,
+				max_count = 12,
+				nodes = {"farming:cotton_3"},
+				actions =
 				{
-					task = npc.actions.cmd.WALK_TO_POS, 
-					args = {
-						end_pos = npc.places.PLACE_TYPE.OTHER.HOME_OUTSIDE, 
-						walkable = {}
-					}
-				},
-				[2] = 
-				{
-					check = true,
-					range = 2,
-					random_execution_times = true,
-					min_count = 10,
-					max_count = 12,
-					nodes = {"farming:cotton_3"},
-					actions = 
+					-- Actions for grown cotton - harvest and replant
+					["farming:cotton_3"] =
 					{
-						-- Actions for grown cotton - harvest and replant
-						["farming:cotton_3"] = 
+						[1] =
 						{
-							[1] = 
+							action = npc.actions.cmd.WALK_STEP,
+						},
+						[2] =
+						{
+							action = npc.actions.cmd.DIG,
+						},
+						[3] =
+						{
+							action = npc.actions.cmd.PLACE,
+							args =
 							{
-								action = npc.actions.cmd.WALK_STEP,
-							},
-							[2] = 
-							{
-								action = npc.actions.cmd.DIG,
-							},
-							[3] = 
-							{
-								action = npc.actions.cmd.PLACE,
-								args = 
-								{
-									node = "farming:cotton_1"
-								}
+								node = "farming:cotton_1"
 							}
 						}
-
-					},
-					none_actions = 
-					{
-						-- Walk a single step in a random direction
-						[1] = {
-								action = npc.actions.cmd.WALK_STEP, 
-								args = 
-								{
-									dir = "random"
-								} 
-						},
 					}
+
+				},
+				none_actions =
+				{
+					-- Walk a single step in a random direction
+					[1] = {
+						action = npc.actions.cmd.WALK_STEP,
+						args =
+						{
+							dir = "random"
+						}
+					},
 				}
 			}
 		}
-	})
+	}
+})