start/stop lightdm instead of running through xvfb (#90)

* start/stop lightdm instead of running through xvfb

* increase collect duration for stress tests

* stats from mangohud

* remove old metrics

* shared type for mangohud stats

Author: mockersf

Cargo.lock

@@ -14,9 +14,6 @@ plotters = "0.3.7"
 tera = "1"
 chrono = "0.4.41"
 statistical = "1.0.0"
-sysinfo = "0.37.0"
-crossbeam = "0.8.4"
-nvml-wrapper = "0.11.0"
 regex = "1.11"
 git2 = "0.20"
 fs_extra = "1.3.0"