Remove fernflower submodule

I think it's simpler for our Fernflower fork to be a standalone project
that we pull in via a normal Maven dependency.

.gitmodules

@@ -1,3 +0,0 @@
-[submodule "fernflower"]
-	path = fernflower
-	url = https://github.com/openrs2/fernflower.git

decompiler/pom.xml

@@ -14,11 +14,6 @@
   <name>OpenRS2 Decompiler</name>
 
   <dependencies>
-    <dependency>
-      <groupId>dev.openrs2</groupId>
-      <artifactId>openrs2-fernflower</artifactId>
-      <version>${project.version}</version>
-    </dependency>
     <dependency>
       <groupId>dev.openrs2</groupId>
       <artifactId>openrs2-util</artifactId>
@@ -28,5 +23,9 @@
       <groupId>ch.qos.logback</groupId>
       <artifactId>logback-classic</artifactId>
     </dependency>
+    <dependency>
+      <groupId>dev.openrs2</groupId>
+      <artifactId>fernflower</artifactId>
+    </dependency>
   </dependencies>
 </project>

fernflower

@@ -1 +0,0 @@
-Subproject commit e4d2d24f9b4d074d3f8c43d3d659535c4f7b15eb

pom.xml

@@ -14,7 +14,6 @@
     <module>decompiler</module>
     <module>deob</module>
     <module>deob-annotations</module>
-    <module>fernflower</module>
     <module>game</module>
     <module>gl-natives</module>
     <module>util</module>
@@ -51,6 +50,11 @@
         <artifactId>asm</artifactId>
         <version>7.1</version>
       </dependency>
+      <dependency>
+        <groupId>dev.openrs2</groupId>
+        <artifactId>fernflower</artifactId>
+        <version>1.0.0-SNAPSHOT</version>
+      </dependency>
       <dependency>
         <groupId>org.ow2.asm</groupId>
         <artifactId>asm-commons</artifactId>
@@ -71,24 +75,12 @@
         <artifactId>slf4j-api</artifactId>
         <version>1.7.26</version>
       </dependency>
-      <dependency>
-        <groupId>org.assertj</groupId>
-        <artifactId>assertj-core</artifactId>
-        <version>3.13.1</version>
-        <scope>test</scope>
-      </dependency>
       <dependency>
         <groupId>org.junit.jupiter</groupId>
         <artifactId>junit-jupiter</artifactId>
         <version>5.5.1</version>
         <scope>test</scope>
       </dependency>
-      <dependency>
-        <groupId>junit</groupId>
-        <artifactId>junit</artifactId>
-        <version>4.12</version>
-        <scope>test</scope>
-      </dependency>
     </dependencies>
   </dependencyManagement>