Update demo_gradio.py

[magickenshin]

• add interface for input target_dir
• add reload button

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[jytime]

Hi would you mind talking more about the goal of adding an extra reload button? It seems the visualisation will be auto-reloaded once some settings are changed.

[magickenshin]

Hi, thanks for your great work! I think we could make it easier to compare camera positions and 3D points after running multiple datasets. Right now, when we finish a reconstruction, the points show up fine - but if I run a second dataset, I can't see the first result. Can we add a "reload" feature so we can always pull up an old reconstruction for comparison?

[jytime]

I see! That makes sense. Let me think for a while how should this be designed.