Posegraph 0.3.6

Reverts the 0.3.5 camera matching changes; behaviour is the same as 0.3.4. Update the backend in Settings.

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撤回 0.3.5 的镜头复刻改动，行为与 0.3.4 相同。请在设置页更新后端。

Backend package / 后端一键包: Posegraph-Backend-win64.zip (Google Drive)