tests: Add test for correct GC with circular references

Makefile: drop -ansi for compat with Lua 5.3+

Keep callbacks in an uservalue instead of by reference

Add missing entries to changelog

Update HTML to reference a local doc.css, and remove W3C-hosted images (a potential privacy leak)

Update index.html for website

Added tag 1.3.0 for changeset 1adb0c435b54

Fix default build parameters not properly linking to libexpat 1.3.0

Update _VERSION, makefile, README and documentation to 1.3.0

Make merging of CharacterData events optional, controlled by the 3rd parameter of lxp.new()

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