Update Android Project Generation to support AGP 4.2.0, Cmake 3.20, and newer versions of NDK&SDK

- build.gradle format updates for newer Android Gradle Plugin
- Remove hard coded Android Gradle Plugin version 3.6.4 to be passed in from command args
- Set Android Gradle Plugin min version 4.2.0 in order to support Min CMake version 3.20
- Add ability to use the android sdk to install missing components if needed rather than doing it externally
- Removed argument to pass in the NDK folder to use the android, use the android-sdk instead. Can request specific NDK versions if possible
- Android Gradle Plugin has dependencies by version and is being managed
- More defaults based on tools on path, agp version made possible so they are no longer needed in the command args

Code/Tools/Android/ProjectBuilder/build.gradle.in

@@ -15,14 +15,14 @@ android {
 ${SIGNING_CONFIGS}
     compileSdkVersion sdkVer
     buildToolsVersion buildToolsVer
-
+    ndkVersion ndkPlatformVer
 	lintOptions {
         abortOnError false
         checkReleaseBuilds false
     }
 
     defaultConfig {
-        minSdkVersion ndkPlatformVer
+        minSdkVersion minSdkVer
         targetSdkVersion sdkVer
 ${NATIVE_CMAKE_SECTION_DEFAULT_CONFIG}
     }

Code/Tools/Android/ProjectBuilder/local.properties.in

@@ -16,6 +16,5 @@
 # For customization when using a Version Control System, please read the
 # header note.
 # ${GENERATION_TIMESTAMP}
-ndk.dir=${ANDROID_NDK_PATH}
 sdk.dir=${ANDROID_SDK_PATH}
 ${CMAKE_DIR_LINE}

Code/Tools/Android/ProjectBuilder/root.build.gradle.in

@@ -12,10 +12,9 @@ buildscript {
     repositories {
         google()
         jcenter()
-
     }
     dependencies {
-        classpath 'com.android.tools.build:gradle:3.6.4'
+        classpath 'com.android.tools.build:gradle:${ANDROID_GRADLE_PLUGIN_VERSION}'
 
         // NOTE: Do not place your application dependencies here; they belong
         // in the individual module build.gradle files
@@ -26,14 +25,14 @@ allprojects {
     repositories {
         google()
         jcenter()
-
     }
 }
 
 subprojects {
     ext {
+        minSdkVer = ${MIN_SDK_VER}
         sdkVer = ${SDK_VER}
-        ndkPlatformVer = ${NDK_PLATFORM_VER}
+        ndkPlatformVer = '${NDK_VERSION}'
         buildToolsVer = '${SDK_BUILD_TOOL_VER}'
         lyEngineRoot = '${LY_ENGINE_ROOT}'
     }