Update build metadata and clean up menu handling

- Bump libappbase to 15.20.34 and libaes to 15.20.17
- Increment buildCount in winboll/build.properties and libwinboll/build.properties (0 → 4)
- Update timestamps to current date
- Apply Java 7 source/target level
- Remove unused library activity menu item from MainActivity

winboll/build.gradle

@@ -18,10 +18,14 @@ def genVersionName(def versionName){
 }
 
 android {
-	// 适配MIUI12
-	compileSdkVersion 30
-    buildToolsVersion "30.0.3"
-	
+ 	// 适配MIUI12
+     compileSdkVersion 30
+ 	
+     compileOptions {
+         sourceCompatibility JavaVersion.VERSION_1_7
+         targetCompatibility JavaVersion.VERSION_1_7
+     }
+ 
     defaultConfig {
         applicationId "cc.winboll.studio.winboll"
         minSdkVersion 26