Large addons might not fit in /tmp

[flatsiedatsie]

Currently the addon installation process downloads new addons to /tmp first.

However, that folder is often mounted in memory, and does not have finite space. Some addons that are very large may not fit.

(The Candle App Store now uses a temporary dir on the user partition instead)

[flatsiedatsie]

Example: https://github.com/createcandle/voco/releases (and Matter Adapter is also getting quite large)