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This commit adds two new configuration options: igpu_desiredgov and igpu_power_threshold which allow for a different CPU governor when the Intel integrated GPU is under load. This currently only applies to Intel integrated GPUs and not AMD APUs because it uses the Intel RAPL infrastructure for getting power information. If on a platform that without an Intel integrated GPU or where the kernel does not support RAPL, the new options will be ignored and it will fall back to the old behavior. One of the core principals of gamemoded to date has been that, when playing a game, we want to use the "performance" CPU governor to increase CPU performance and prevent CPU-limiting. However, when the integrated GPU is under load, this can be counter-productive because the CPU and GPU share a thermal and power budget. By throwing the CPU governor to "performance" game mode currently makes the CPU frequency management far too aggressive and it burns more power than needed. With a discrete GPU, this is fine because the worst that happens is a bit more fan noise. With an integrated GPU, however, the additional power being burned by the CPU is power not available to the GPU and this can cause the GPU to clock down and lead to significantly worse performance. By using the "powersave" governor instead of the "performance" governor while the integrated GPU is under load, we can save power on the CPU side which lets the GPU clock up higher. On my Razer Blade Stealth 13 with an i7-1065G7, this improves the performance of "Shadow of the Tomb Raider" by around 25-30% according to its internal benchmark mode.