cpu: priority matching for cpu temp

[fxzzi]

before, mangohud would loop through hwmon's in order, and use the first one it found that had a valid temperature sensor that we were looking for.

however, in some cases, the hwmon for a worse sensor can be read first, and therefore used, over a more accurate cpu temp sensor. On my system:

$ for n in /sys/class/hwmon/hwmon*/name; do echo "$n: $(cat "$n")"; done
/sys/class/hwmon/hwmon0/name: nvme
/sys/class/hwmon/hwmon1/name: nvme
/sys/class/hwmon/hwmon2/name: nct6798
/sys/class/hwmon/hwmon3/name: k10temp
/sys/class/hwmon/hwmon4/name: zenergy
/sys/class/hwmon/hwmon5/name: asusec
/sys/class/hwmon/hwmon6/name: asus

the nct temp sensor would be picked first, and this sensor has very bad accuracy to my real temperature, I've seen it showing upwards of 10C lower than the CPU real temperature, better reported by k10temp.

so, implement a priority system when looping through hwmon.

[soerengrunewald]

LGTM, in fact it should work even better than the original solution. Since the current implementation does not always check if find_input is actually successful, while this does. So we can avoid the situation where we think we have found a valid sensor, but actually have not, therefore 👍 from me.

[fxzzi]

rebased on top of main. Commit d24ddd1 conflicted but I think I got it working again

[soerengrunewald]

After actually trying the code, I notice some issues that need to be changed first.

[fxzzi]

thanks again for the review and recommendations. I have now implemented those changes, as well as rebased on the latest master.

I kept the empty check since it shouldn't hurt.