SGML, HTML, Sitemap, RSS, SVG targets (#2)

- New libraries (SwiftSgml, SwiftSitemap, SwiftRss, SwiftSvg)
- Unspecified document type is the default
- New SVG tags (ellipse, path, polygon, polyline, rect)
- New RSS tags
- New Sitemap tags

Author: tib

Package.swift

@@ -7,18 +7,41 @@ let package = Package(
        .macOS(.v10_15)
     ],
     products: [
+        .library(name: "SwiftSgml", targets: ["SwiftSgml"]),
         .library(name: "SwiftHtml", targets: ["SwiftHtml"]),
+        .library(name: "SwiftSvg", targets: ["SwiftSvg"]),
+        .library(name: "SwiftSitemap", targets: ["SwiftSitemap"]),
+        .library(name: "SwiftRss", targets: ["SwiftRss"]),
     ],
     dependencies: [
 
     ],
     targets: [
+        .target(name: "SwiftSgml", dependencies: []),
         .target(name: "SwiftHtml", dependencies: [
-            
+            .target(name: "SwiftSgml")
+        ]),
+        .target(name: "SwiftSvg", dependencies: [
+            .target(name: "SwiftSgml")
+        ]),
+        .target(name: "SwiftSitemap", dependencies: [
+            .target(name: "SwiftSgml")
+        ]),
+        .target(name: "SwiftRss", dependencies: [
+            .target(name: "SwiftSgml")
         ]),
         .testTarget(name: "SwiftHtmlTests", dependencies: [
             .target(name: "SwiftHtml"),
         ]),
+        .testTarget(name: "SwiftSvgTests", dependencies: [
+            .target(name: "SwiftSvg"),
+        ]),
+        .testTarget(name: "SwiftSitemapTests", dependencies: [
+            .target(name: "SwiftSitemap"),
+        ]),
+        .testTarget(name: "SwiftRssTests", dependencies: [
+            .target(name: "SwiftRss"),
+        ]),
     ]
 )