Add H2 dependency by default

modules/flowable-ui-idm/flowable-ui-idm-app/pom.xml

@@ -69,6 +69,10 @@
             <groupId>com.mchange</groupId>
             <artifactId>c3p0</artifactId>
         </dependency>
+        <dependency>
+            <groupId>com.h2database</groupId>
+            <artifactId>h2</artifactId>
+        </dependency>
 
         <!-- JSON -->
         <dependency>

modules/flowable-ui-modeler/flowable-ui-modeler-app/pom.xml

@@ -79,6 +79,10 @@
             <groupId>com.mchange</groupId>
             <artifactId>c3p0</artifactId>
         </dependency>
+        <dependency>
+            <groupId>com.h2database</groupId>
+            <artifactId>h2</artifactId>
+        </dependency>
 
         <!-- LOGGING -->
         <dependency>

modules/flowable-ui-task/flowable-ui-task-app/pom.xml

@@ -118,6 +118,10 @@
             <groupId>com.mchange</groupId>
             <artifactId>c3p0</artifactId>
         </dependency>
+        <dependency>
+            <groupId>com.h2database</groupId>
+            <artifactId>h2</artifactId>
+        </dependency>
 
         <!-- LOGGING -->
         <dependency>