linter: 1. don't report error for special saxon extension types prefixed with '~' character

2. don't report error for 'xs:anyAtomicType' - it doesn't have a constructor

Author: pgfearo

src/xsltTokenDiagnostics.ts

@@ -2023,7 +2023,7 @@ export class XsltTokenDiagnostics {
 let tValue = token.value;
 let tParts = tValue.split(':');
 let isValidType = false;
-if (tValue === '*' || tValue === '?' || tValue === '+') {
+if (tValue === '*' || tValue === '?' || tValue === '+' || tValue.startsWith('~')) {
 // e.g. xs:integer* don't check name
 isValidType = true;
 } else if (tParts.length === 1) {
@@ -2039,7 +2039,8 @@ export class XsltTokenDiagnostics {
 let nsType = xsltPrefixesToURIs.get(tParts[0]);
 if (nsType !== undefined) {
 if (nsType === XSLTnamespaces.XMLSchema) {
-if (tParts[1] === 'numeric') {
+const part2 = tParts[1];
+if (part2 === 'numeric' || part2 === 'anyAtomicType') {
 isValidType = true;
 } else {
 isValidType = FunctionData.schema.indexOf(tParts[1] + '#1') > -1;