Added sysfs monitoring bar variables

[mfluhr]

Description

I used "hwmon" for years now to monitor my CPU core temps, but needed to fallback to an execbar to have those values shown as bar nearby. Since doing so for all cores is quite heavy, I added some sysfs bar variables (hwmonbar, i2cbar and platformbar) that basically fill this gap. Doing so, spared me some CPU usage.

The code should not affect existing conky configurations, since it is new variables addition.

I tested this using the "hwmonbar" variable to monitor my AMD CPU core package temps, replacing this
${execbar sensors -u k10temp-pci-00c3 | grep temp1_input | awk '{print $2}' | cut -d '.' -f1}
with this
${hwmonbar k10temp temp2 1 1.0 0.0}

One important note: Due to the bar scaling when calling setup_bar(), the factor and offset should be adjusted properly so that the value is always inside a 0-100 range.

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[brndnmtthws]

Thanks for the addition. I think there are a couple issues to fix before merge:

1. platformbar is wired to parse_i2c_bar, so it uses the i2c sysfs path and will not find platform devices. It should call parse_platform_bar. (src/core.cc)
2. sysfs_sensor_barval clamps negative values to 100.0 instead of 0.0, so a negative value shows a full bar. (src/data/os/linux.cc)

Please address these and I’m happy to re-review.

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[mfluhr]

Whoops.... Those were 2 very dumb mistakes!
I just fixed them and amended the initial commit.