Large changeset, first part of editing H3 objects via mods feature. Changes:

- loading of all objects (including H3 objects) will be directed by mod handlers
- common base for all handlers accessible from mod system (IHanderBase)
- json format changes: use struct with string ID's instead of vector

- fixed some gcc/clang errors and warnings
- fixed several cases of memory leaks and invalid memory access (mostly related to usage of bonus system and/or identifiers resolution)

Note that right now loading is much slower than before due to excessive json validation (or not fast enough validator)

config/schemas/faction.json

@@ -141,8 +141,8 @@
 					"description": "Path to .def file with building icons"
 				},
 				"buildings": {
-					"type" : "array",
-					"items" : {
+					"type" : "object",
+					"additionalProperties" : {
 						"$ref" : "vcmi:townBuilding"
 					}
 				},
@@ -242,8 +242,8 @@
 					"$ref" : "vcmi:townSiege"
 				},
 				"structures": {
-					"type" : "array",
-					"items" : {
+					"type" : "object",
+					"additionalProperties" : {
 						"$ref" : "vcmi:townStructure"
 					}
 				},