Processing of ties when importing MusicXML

[mrhso]

The current code has the following logic:

utaformatix3/core/src/main/kotlin/core/io/MusicXml.kt

Lines 224 to 228 in acdc987

	when (noteNode.getSingleElementByTagNameOrNull("tie")?.getAttribute("type")) {
	"start" -> isInsideNote = true
	"stop" -> isInsideNote = false
	else -> Unit
	}

However, if a note value is represented by no less than 3 notes, there will be more than one tie:

<tie type="stop"/>
<tie type="start"/>

Therefore, all tie tags should be read.