Daemon mode

[saghen]

On my system, the popup takes ~500ms to launch, possibly in large part due to #183. Other projects which need to launch a window quickly often use a systemd service or shared instance to mitigate the vast majority of the startup time (kitty, foot, ulauncher). It also offers a simpler solution for singleton #179 without file locking, although file locks are still beneficial since they work without the daemon. I'd be happy to send a PR for this, what do you think?

[friedow]

Hehe, thinking alike. Guess what, I'm working on exactly this over on this branch: https://github.com/friedow/centerpiece/tree/feat/ipc-plugin.

[choucavalier]

that would be great! thx @friedow :) we need an instant launcher!

[friedow]

The reason why I've not finished this yet is that the daemon mode feels like a stopgap solution to the larger issue that iced is not optimized for fast application startup. I would rather tackle the root cause of this problem this is why I'm currently experimenting with switching to another ui framework. For more information see issue #246.