update changelog and packaging for version 1.55.1

Fix sequence in _putimages() by writing values back to underlying map #5

add version 1.55.0 changelog entry for PR #4 Fix Image alpha channel …

…processing and packing

update versioning to 1.54.0 Release

* GIF image support
* PNG alpha channel support

bump version to 1.53.2, update changelog with image processing updates

improve character width loading from resources and error messages whe…

…n the resource is not found