Corentin Plouët

Added power saving mode (docking branch)

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This is the docking/viewport branch version of the power saving mode implemented in #2749. That PR has a lot of background regarding how that feature came to be. The next...

Added power saving mode

32

**What** When enabled, this mode reduces the frame rate (potentially down to zero) by waiting for inputs (i.e. blocking/sleeping). Both ImGui and user code can require a minimum frame rate...