fix: load before-plugins.gradle in build.gradle to allow to override androidBuildToolsVersion and other vars

Author: farfromrefug

test-app/build.gradle

@@ -122,6 +122,15 @@ version of the {N} CLI install a previous version of the runtime package - 'tns
 
     }
 
+    def applyBeforePluginGradleConfiguration = { ->
+        def appResourcesPath = getAppResourcesPath()
+        def pathToBeforePluginGradle = "$appResourcesPath/Android/before-plugins.gradle"
+        def beforePluginGradle = file(pathToBeforePluginGradle)
+        if (beforePluginGradle.exists()) {
+            outLogger.withStyle(Style.SuccessHeader).println "\t + applying user-defined configuration from ${beforePluginGradle}"
+            apply from: pathToBeforePluginGradle
+        }
+    }
     def applyBuildScriptConfigurations = { ->
         def absolutePathToAppResources = getAppResourcesPath()
         def pathToBuildScriptGradle = "$absolutePathToAppResources/Android/rootbuildscript.gradle"
@@ -143,6 +152,7 @@ version of the {N} CLI install a previous version of the runtime package - 'tns
 
     initialize()
     applyBuildScriptConfigurations()
+    applyBeforePluginGradleConfiguration()
 
     def computeKotlinVersion = { -> project.hasProperty("kotlinVersion") ? kotlinVersion : "${kotlin_version}"
     }