Fix parsing of HTML in frontend

Process a-Tags.
Do not mark p-Tag as external block, otherwise processing would need to
be defined.

Configuration/TypoScript/Setup/ContentElements/ParseFunc.typoscript

@@ -4,13 +4,30 @@ lib.parseFunc {
     makelinks {
         http {
             keep = {$styles.content.links.keep}
-            extTarget = {$styles.content.links.extTarget}
+            extTarget = _blank
         }
         mailto {
             keep = path
         }
     }
     tags {
+        a = TEXT
+        a {
+            current = 1
+            typolink {
+                parameter.data = parameters:href
+                title.data = parameters:title
+                ATagParams.data = parameters:allParams
+                # the target attribute takes precedence over config.intTarget
+                target.ifEmpty.data = parameters:target
+                # the target attribute takes precedence over the constant (styles.content.links.extTarget)
+                # which takes precedence over config.extTarget
+                # do not pass extTarget as reference, as it might not be set resulting in the string being
+                # written to the target attribute
+                extTarget.ifEmpty < config.extTarget
+                extTarget.override.data = parameters:target
+            }
+        }
         pre = USER
         pre {
             userFunc = DanielSiepmann\DsSite\UserFunction\CodeHighlighting->preTag
@@ -33,7 +50,7 @@ lib.parseFunc {
 lib.parseFunc_RTE < lib.parseFunc
 lib.parseFunc_RTE {
     # Processing <ol>, <ul> and <table> blocks separately
-    externalBlocks = blockquote, div, dd, dl, ol, ul, pre, p
+    externalBlocks = blockquote, div, dd, dl, ol, ul, pre
     externalBlocks {
         ol {
             stripNL = 1