dbus: Return value after setting

arch: Fix an issue with --subscribe and eavesrop=true

Update dbus to v5.1.0

This makes the code a bit simpler since we no longer have to check if
the primitive values are pointers or not.

Merge pull request #7 from jeremija/jeremija/initialize-display-after…

…-dbus

Initialize display after connecting to DBus

Add --subscribe parameters: Temperature/Brightness

Merge pull request #5 from jeremija/jeremija/dbus

Use dbus instead of internal service

Implement subscriptions (#2)

* Implement subscriptions

* Handle pipe failures, add waybar example for --subscribe

* Format float to max two decimal points

* Clamp brightness to [0, 1]

* Add --reconnect-timeout

* Remove --history flag

Add ability to specify version and commit_hash externally

Add --verbose option and change default socket path

Default to tmp file