Replace atoi and atol with strtol (most files).

[pghvlaans]

Descriptions

• Pursuant to the comment by @su8 in Linux: show the CPU scaling governor with $cpugovernor #1223, replace most of the remaining instances of atoi and all three instances of atol with strtol to prevent undefined behavior.
• Testing revealed no changes in existing behavior.
• I tested all of the atoi-using variables I could in patched and unpatched conky, and none of them appeared to show changed behavior. I haven't been able to test anything related to i8k.cc, ibm.cc, nvidia.cc (don't have the hardware) or openbsd.cc (haven't managed to build conky). To be extra-safe, I've left those files out of the commit, but modified versions can be found in a separate branch called "untested-atoi." If I should push those as well, just let me know!
• Screenshots: There would be a lot of screenshots. I can probably get those arranged by sometime next week if necessary.

Licenses

• No new files.

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[pghvlaans]

Just for reference, there are a few remaining instances of atoi in those files that I couldn't test properly:

• i8k.cc:96
• ibm.cc:289, 295
• openbsd.cc:486, 487, 491
• nvidia.cc:431