Saves NPCs immediately after they are changed

Additionally:
Updates Citizens dependency to the newest version
Removes some redundancy in NPC settings' path

pom.xml

@@ -13,8 +13,6 @@
     <!-- Properties -->
     <properties>
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
-        <citizensapi.version>2.0.26-SNAPSHOT</citizensapi.version>
-        <vault.version>1.7.3</vault.version>
         <build.number>Unknown</build.number>
     </properties>
 
@@ -38,10 +36,16 @@
     <dependencies>
         <dependency>
             <groupId>net.citizensnpcs</groupId>
-            <artifactId>citizens</artifactId>
-            <version>${citizensapi.version}</version>
+            <artifactId>citizens-main</artifactId>
+            <version>2.0.30-SNAPSHOT</version>
             <type>jar</type>
-            <scope>compile</scope>
+            <scope>provided</scope>
+            <exclusions>
+                <exclusion>
+                    <groupId>*</groupId>
+                    <artifactId>*</artifactId>
+                </exclusion>
+            </exclusions>
         </dependency>
         <dependency>
             <groupId>org.spigotmc</groupId>
@@ -52,7 +56,7 @@
         <dependency>
             <groupId>net.milkbowl.vault</groupId>
             <artifactId>Vault</artifactId>
-            <version>${vault.version}</version>
+            <version>1.7.3</version>
             <scope>provided</scope>
         </dependency>
         <dependency>
@@ -81,8 +85,8 @@
                 <artifactId>maven-compiler-plugin</artifactId>
                 <version>3.7.0</version>
                 <configuration>
-                    <source>17</source>
-                    <target>17</target>
+                    <source>16</source>
+                    <target>16</target>
                 </configuration>
             </plugin>
         </plugins>