build: modernize Gradle to AGP 8.5 with wrapper and namespace

app/build.gradle

@@ -1,23 +1,37 @@
-apply plugin: 'com.android.application'
+plugins {
+    id 'com.android.application'
+}
 
 android {
-    compileSdkVersion 21
+    namespace 'com.wytehat.btlogger'
+    compileSdk 34
 
     defaultConfig {
         applicationId "com.wytehat.btlogger"
-        minSdkVersion 14
-        targetSdkVersion 29
+        // BLE scanning (ScanCallback, ScanResult) is API 21+, which the
+        // range finder relies on.
+        minSdk 21
+        // Deliberately left at 29: the service uses version-guarded
+        // reflection and legacy PendingIntent flags that change behaviour
+        // at targetSdk 31+.
+        targetSdk 29
         versionCode 1
         versionName "1.0"
     }
+
     buildTypes {
         release {
             minifyEnabled false
             proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
         }
     }
+
+    compileOptions {
+        sourceCompatibility JavaVersion.VERSION_17
+        targetCompatibility JavaVersion.VERSION_17
+    }
 }
 
 dependencies {
-    compile fileTree(dir: 'libs', include: ['*.jar'])
+    implementation fileTree(dir: 'libs', include: ['*.jar'])
 }

app/src/main/AndroidManifest.xml

@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
-<manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.wytehat.btlogger">
+<manifest xmlns:android="http://schemas.android.com/apk/res/android">
  <uses-permission android:name="android.permission.BLUETOOTH"/><uses-permission android:name="android.permission.BLUETOOTH_ADMIN"/>
  <uses-permission android:name="android.permission.BLUETOOTH_CONNECT"/><uses-permission android:name="android.permission.BLUETOOTH_SCAN"/>
  <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION"/><uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION"/>