Get color from TimeTableElement from Resources

[d-Rickyy-b]

Currently the color is hard coded - not taken from the resources.
This should change, but would need a context.

MGGVertretungsplan/app/src/main/java/de/aurora/mggvertretungsplan/datamodel/TimeTableElement.java

Lines 194 to 203 in 282386f

	public int getColor() {
	switch (type) {
	case CANCELLATION:
	return Color.parseColor("#FF6961");
	case SUBSTITUTION:
	return Color.parseColor("#779ECB");
	default:
	return Color.parseColor("#F5F5F5");
	}
	}

[d-Rickyy-b]

It would be better to move the code to identify the color to the view, not to the datamodel.