AK+Everywhere: Replace usages of URLParser::urlencode() and urldecode()

This replaces all occurrences of those functions with the newly
implemented functions URL::percent_encode() and URL::percent_decode().
The old functions will be removed in a further commit.

AK/URL.h

@@ -9,7 +9,6 @@
 
 #include <AK/String.h>
 #include <AK/StringView.h>
-#include <AK/URLParser.h>
 
 namespace AK {
 
@@ -62,8 +61,7 @@ public:
     String to_string() const;
     String to_string_encoded() const
     {
-        // Exclusion character set is the same JS's encodeURI() uses
-        return urlencode(to_string(), "#$&+,/:;=?@");
+        return percent_encode(to_string(), PercentEncodeSet::EncodeURI);
     }
 
     URL complete_url(const String&) const;