Enable Spectre and Meltdown mitigations

The FeatureSettingsOverride registry key in Windows, typically found under SYSTEM\CurrentControlSet\Control\Session Manager\Memory Management and often managed alongside FeatureSettingsOverrideMask, provides administrators with granular control over software-based mitigations for CPU speculative execution vulnerabilities like Spectre and Meltdown. These vulnerabilities can potentially allow unauthorized access to sensitive data. Windows implements various mitigations to counter these threats, but they can sometimes introduce performance overhead. The FeatureSettingsOverride key allows for a tailored approach, enabling administrators to selectively enable or disable specific mitigations—such as those for different variants of Spectre (like v2 or Speculative Store Bypass - SSB) and Meltdown—or even to disable all of them if the performance impact is deemed too high for a particular environment, or to apply specific configurations like disabling Hyper-Threading on Intel CPUs in conjunction with these mitigations.