// Adds a screenshot to the user's screenshot library from disk. If a thumbnail is provided, it must be 200 pixels wide and the same aspect ratio
// as the screenshot, otherwise a thumbnail will be generated if the user uploads the screenshot. The screenshots must be in either JPEG or TGA format.
// The return value is a handle that is valid for the duration of the game process and can be used to apply tags.
// Causes the Steam overlay to take a screenshot. If screenshots are being hooked by the game then a ScreenshotRequested_t callback is sent back to the game instead.
voidTriggerScreenshot();
// Toggles whether the overlay handles screenshots when the user presses the screenshot hotkey, or the game handles them. If the game is hooking screenshots,
// then the ScreenshotRequested_t callback will be sent if the user presses the hotkey, and the game is expected to call WriteScreenshot or AddScreenshotToLibrary
// in response.
voidHookScreenshots(boolbHook);
// Sets metadata about a screenshot's location (for example, the name of the map)