change file extension for filter lists

this means that IDEs should now recognise comments

src/main/java/dev/piotr_weychan/szlaban/firewall/FirewallModule.java

@@ -99,8 +99,8 @@ public final class FirewallModule extends AbstractModule {
   @Override
   public void onRegister() {
     // populate the default configs
-    plugin.saveResource("allowlist.txt", false);
-    plugin.saveResource("blocklist.txt", false);
+    plugin.saveResource("allowlist.cfg", false);
+    plugin.saveResource("blocklist.cfg", false);
 
     // store the config
     ConfigurationSection firewallConfig = Objects.requireNonNull(

src/main/resources/blocklist.cfg

@@ -2,3 +2,4 @@
 # 0.0.0.0/0         # Blocks ALL IPv4 Addresses
 # ::/0              # Blocks ALL IPv6 Addresses
 # Add custom entries below:
+192.168.1.151/32

src/main/resources/config.yml

@@ -59,7 +59,7 @@ firewall:
   # - Local file paths are relative to the plugin's config directory
   #     i.e. plugins/Szlaban/
   blocklists:
-    - blocklist.txt
+    - blocklist.cfg
     - https://github.com/pebblehost/hunter/raw/refs/heads/master/ips.txt
 
   # A list of files containing IPs/CIDR ranges that should always be allowed
@@ -69,7 +69,7 @@ firewall:
   # While there isn't a deny-all mode by default, this can be achieved quite easily
   # by adding 0.0.0.0/0 and ::/0 to your blocklists.
   allowlists:
-    - allowlist.txt
+    - allowlist.cfg
 
   # How often (in seconds) the plugin should automatically re-read the contents of
   # each kind of blocklist file.