Release TMX for Tiled 1.4

It includes the following new features:
+ Add zStandard support
+ Add support for layer tintcolor
+ Add support for tileset objectalignment

Fix github action "release"

Closes baylej#53

Release TMX for QtTiled 1.1

It includes the following new features:
+ Explicitely fail to load infinite maps
+ Support object templates
+ Add documentation in rst format, generate HTML doc using sphinx
+ Add emscripten compatibility (HTML5 support)
+ baylej#39 Support alpha channel for colours
+ baylej#41 Add functions to convert colours

It includes the following bug fixes:
+ baylej#32 Ignore DOCTYPE element in XML document
+ Add missing freeing of object properties
+ Fix parsing of staggered map orientation
+ baylej#33 Fix parsing of text wrap attribute
+ baylej#34 Support uncompressed base64 encoded layers
+ baylej#36 Cast to float the value returned by `atof`
+ Add missing `extern` qualifier to global variable
+ Use `uint32_t` for GIDs

It includes the following maintenance patches:
+ Mordernize CMake scripts
+ Add CI/CD pipelines using github actions
+ baylej#47 CMake: Add src/ to the include directories
+ baylej#48 Change file permissions from 755 to 644

Release TMX for QtTiled 1.0

It includes the following fix:
+ baylej#29 Check whether <objectgroup> is empty

It includes the following new features:
+ Add hashtable to store properties
+ Add more IO options:
  Load maps from a file descriptor, a buffer or using a callback
+ Add a tileset manager to hold references to external tilesets.
+ Add text object support
+ Add Group layer support
+ Add tile type support

Release TMX for QtTiled 0.17.

This release contains the following fixes:
+ baylej#28 Fix c++ compatibility

Release TMX for QtTiled 0.17.0

This release supports the property types `color` and `file` added in
QtTiled 0.17.

Release TMX for QtTiled 0.16.0

This release supports the property types added in QtTiled 0.16.

Release TMX v0.15.1

Add UNUSED macro

Suppresses `unused parameter` warnings with GCC and CLANG

Release version 0.13.1