Missing alternative text for Cancel and Torch buttons

[Erdragh]

An accessibility audit of our mobile app indicated that these two buttons:

do not have an alternative text.

Both of these only contain an image:

OSBarcodeLib-iOS/Sources/OSBarcodeLib/Scanner/Interface Elements/OSBARCCancelButton.swift

Lines 23 to 28 in bd584f0

	Button(action: action) {
	Image(systemName: cancelIcon) // SF Symbols value.
	.imageScale(cancelIconScale)
	.foregroundStyle(forColour: foregroundColour)
	.padding(iconPadding)
	}

OSBarcodeLib-iOS/Sources/OSBarcodeLib/Scanner/Interface Elements/OSBARCTorchButton.swift

Lines 29 to 42 in bd584f0

	Button(action: action) {
	Image(iconName, bundle: Bundle.imageBundle)
	.frame(width: size, height: size)
	.background(
	Circle()
	.foregroundStyle(forColour: backgroundColour)
	)
	.if(!isOn) {
	$0.overlay(
	Circle()
	.stroke(overlayColour, lineWidth: stroke)
	)
	}
	}