river 0.3.4

This release fixes a number of bugs including a few possible crashes.
Thank you for all the high quality bug reports!

Full changelog:

Isaac Freund (14):
      build: bump version to 0.3.4-dev
      ci: use mirror for zig tarball downloads
      ci: re-enable FreeBSD builds
      ci: log build summaries
      SceneNodeData: fix fromSurface() use after free
      input: apply map-to-output on output activation
      Output: flag gamma as dirty on enable
      Xwayland: fix unsound cast
      docs: tweak repology link wording in readme
      Output: fix Wayland backend support
      XdgPopup: send configure after initial commit
      layer-shell: fix on_demand keyboard focus
      PointerConstraint: fix assertion failure
      build: bump version to 0.3.4

Palanix (1):
      docs: mention zig build -h in readme