Upgrade realm

Update proguard file so we could potentially enable proguard in the future
Update dependencies
Downgrade duktape to fix MangaPlus
Remove useless dependencies
Remove useless tabGravity
Fix debug version crashing in background

app/src/main/java/eu/kanade/tachiyomi/App.kt

@@ -188,12 +188,17 @@ open class App : Application() {
 
     // EXH
     private fun setupDebugOverlay() {
-        DebugOverlay.Builder(this)
-                .modules(FpsModule(), EHDebugModeOverlay(this))
-                .bgColor(Color.parseColor("#7F000000"))
-                .notification(false)
-                .allowSystemLayer(false)
-                .build()
-                .install()
+        try {
+            DebugOverlay.Builder(this)
+                    .modules(FpsModule(), EHDebugModeOverlay(this))
+                    .bgColor(Color.parseColor("#7F000000"))
+                    .notification(false)
+                    .allowSystemLayer(false)
+                    .build()
+                    .install()
+        } catch(e: IllegalStateException) {
+            // Crashes if app is in background
+            XLog.e("Failed to initialize debug overlay, app in background?", e)
+        }
     }
 }