feat: allow webhook removal on config import

[iProdigy]

Closes #659

[iProdigy]

do we care about making the hostname comparison case-insensitive?

Subject: [PATCH] fix: use case-insensitive host comparison
---
Index: src/main/java/dinkplugin/SettingsManager.java
IDEA additional info:
Subsystem: com.intellij.openapi.diff.impl.patch.CharsetEP
<+>UTF-8
===================================================================
diff --git a/src/main/java/dinkplugin/SettingsManager.java b/src/main/java/dinkplugin/SettingsManager.java
--- a/src/main/java/dinkplugin/SettingsManager.java	
+++ b/src/main/java/dinkplugin/SettingsManager.java	
@@ -614,10 +614,13 @@
         if (!(input instanceof Iterable)) return false;
 
         // read deleted urls
-        Set<String> deletedUrls = new HashSet<>();
+        Set<HttpUrl> deletedUrls = new HashSet<>();
         for (Object o : (Iterable<?>) input) {
             if (o instanceof String) {
-                deletedUrls.add((String) o);
+                var url = HttpUrl.parse((String) o);
+                if (url != null) {
+                    deletedUrls.add(url);
+                }
             }
         }
 
@@ -628,6 +631,8 @@
             String configValue = configManager.getConfiguration(CONFIG_GROUP, webhookConfigKey);
             boolean[] filtered = { false };
             String updatedValue = ConfigUtil.readDelimited(configValue)
+                .map(HttpUrl::parse)
+                .filter(Objects::nonNull)
                 .filter(url -> {
                     if (deletedUrls.contains(url)) {
                         filtered[0] = true;
@@ -635,6 +640,7 @@
                     }
                     return true;
                 })
+                .map(HttpUrl::toString)
                 .collect(Collectors.joining("\n"));
             if (filtered[0]) {
                 configManager.setConfiguration(CONFIG_GROUP, webhookConfigKey, updatedValue);