Allows start, end, justify-all and match-parent as text-align values.

[martin-jackson]

After this change, all values currently listed on MDN for text-align are allowed: https://developer.mozilla.org/en-US/docs/Web/CSS/text-align#values

left and right are not in textAlignLiterals0, but they are already included through azimuthLiterals1:

java-html-sanitizer/owasp-java-html-sanitizer/src/main/java/org/owasp/html/CssSchema.java

Line 315 in f729a08

Set<String> azimuthLiterals1 = j8().setOf("left", "right");

java-html-sanitizer/owasp-java-html-sanitizer/src/main/java/org/owasp/html/CssSchema.java

Lines 714 to 716 in f729a08

	Property textAlign = new Property(
	0, union(azimuthLiterals1, textAlignLiterals0), zeroFns);
	builder.put("text-align", textAlign);