Release TMX for Tiled 1.10

It includes the following new features:
* Parallax
* Load functions to work with virtual paths
* Object property type (by ID reference)
* Custom property types
* Class of map/layer/tilset
* Justify horizontal alignment
* Tile render size
* Tile fill mode
* Tile width and height (in tile atlases)
* Image layer repeat
* Utility function: tmx_find_object_by_id
* Utility function: tmx_find_tileset_by_name

In includes the following bug fixes:
* layer.id is not mandatory
* libXml2 lookup
* Include stdlib.h is missing

Contributors:
* Rob Loach
* Kai Pastor
* Connor Rigby
* Ghassan Al-Mashareqa

CMakeLists.txt

@@ -1,6 +1,6 @@
 cmake_minimum_required(VERSION 3.5)
 
-project(tmx VERSION 1.4.0 LANGUAGES C)
+project(tmx VERSION 1.10.0 LANGUAGES C)
 
 add_subdirectory(doc) # Sphinx documentation