Added category functionality

Added ability to create category XML tags within program based upon filter tags in API response.

Includes removal of 'filter-' from the filter parameter provided.

Author: williamwscode

src/xmltv.ts

@@ -78,6 +78,15 @@ export function buildProgramsXml(data: GridApiResponse): string {
         xml += `    <desc>${escapeXml(event.program.shortDesc)}</desc>\n`;
       }
 
+      if (event.filter && event.filter.length > 0) {
+        for (let i = 0; i < event.filter.length; i++) {
+          const category = event.filter[i].match(/^(filter)-(.*?)$/);
+          if (category) {
+            xml += `    <category lang="en">${category[2]}</category>`;
+          }
+        }
+      }
+      
       if (event.rating) {
         xml += `    <rating system="MPAA"><value>${escapeXml(
           event.rating,