SDL: put debug info from shared libraries into app bundle, updated build scripts to remove hacks and better integrate with Gradle

project/app/build-template.gradle

@@ -5,6 +5,7 @@ plugins {
 android {
     compileSdkVersion 30
     buildToolsVersion "30.0.3"
+    ndkVersion "22.0.7026061"
 
     defaultConfig {
         applicationId "net.olofson.ballfield"
@@ -16,6 +17,9 @@ android {
         release {
             minifyEnabled true
             proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), '../proguard-local.cfg', '../proguard.cfg'
+            ndk {
+                debugSymbolLevel 'FULL'
+            }
         }
     }
     compileOptions {