wip: changelog

Author: stergiotis

CHANGELOG.md

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+# Changelog
+
+### Breaking changes:
+* Remove `imgui_glfw`, a demonstration of the imzero ipc protocol using stock ImGui rather than the Skia backend imgui contained in this repository.                                
+* Remove colored buttons. The style is alien to the rest of ImGui, and the code is crusty and unmaintained.
+
+### Changes:
+* Fixing window decoration.
+* Compile on SteamOS 3.6.
+* Use SDL 3.2.4.
+* Use ImGui v1.91.9 wip.
+* Update other minor dependencies.