v0.7.4: centralized more build script properties

SPD-classes/build.gradle

@@ -1,10 +1,10 @@
 apply plugin: 'com.android.library'
 
 android {
-    compileSdkVersion 28
+    compileSdkVersion appAndroidCompileSDK
 
     defaultConfig {
         //noinspection MinSdkTooLow
-        minSdkVersion 9
+        minSdkVersion appAndroidMinSDK
     }
 }

build.gradle

@@ -13,6 +13,10 @@ allprojects {
     ext {
         appVersionCode = 353
         appVersionName = '0.7.4-BETA-4'
+
+        appAndroidCompileSDK = 28
+        appAndroidMinSDK = 9
+        appAndroidTargetSDK = 28
     }
     version = appVersionName
 

core/build.gradle

@@ -1,14 +1,14 @@
 apply plugin: 'com.android.application'
 
 android {
-    compileSdkVersion 28
+    compileSdkVersion appAndroidCompileSDK
 
     defaultConfig {
         resConfigs "en_US", "cs", "tr", "ca", "ko", "pl", "it",
                 "eo", "ru", "zh_CN", "de", "fr", "es", "pt", "fi", "hu", "in"
         //noinspection MinSdkTooLow
-        minSdkVersion 9
-        targetSdkVersion 28
+        minSdkVersion appAndroidMinSDK
+        targetSdkVersion appAndroidTargetSDK
         versionCode appVersionCode
         versionName appVersionName
     }