v0.3

gdnative binaries for 64-bit macOS, GNU/Linux and Windows

Fixes some issues, new font fallback system, added backported Godot Label/LineEdit controls, updated to 3.1.1 API.

Build config (with graphite):

-Dgodot-cpp-lib-name=libgodot-cpp -Dstatic-runtime=true -Dbuiltin-runtime=true -Duse-graphite2=true --buildtype=release

Build config (without graphite):

-Dgodot-cpp-lib-name=libgodot-cpp -Dstatic-runtime=true -Dbuiltin-runtime=true -Duse-graphite2=false --buildtype=release