Update Insets implementation to new Android 11 APIs

- We now use the new backported APIs in AndroidX Core
- Also renamed some APIs to be more consistent
- Added some docs
- Moved Jetsnack over to our public insets impl

Change-Id: Id7309e5ad69855ace8abf6c9470c75594d9390eb

Author: Chris

Jetcaster/app/src/main/java/com/example/jetcaster/ui/MainActivity.kt

@@ -17,24 +17,18 @@
 package com.example.jetcaster.ui
 
 import android.os.Bundle
-import android.view.View
 import androidx.appcompat.app.AppCompatActivity
 import androidx.compose.ui.platform.setContent
+import androidx.core.view.WindowCompat
 import com.example.jetcaster.ui.theme.JetcasterTheme
 import com.example.jetcaster.util.ProvideDisplayInsets
 
 class MainActivity : AppCompatActivity() {
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
 
-        /**
-         * TODO: Move to WindowCompat.setDecorFitsSystemWindows() when it lands in
-         * android.core:core 1.5.0-alpha02
-         */
-        @Suppress("DEPRECATION")
-        window.decorView.systemUiVisibility = View.SYSTEM_UI_FLAG_LAYOUT_STABLE or
-            View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN or
-            View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION
+        // This app draws behind the system bars, so we want to handle fitting system windows
+        WindowCompat.setDecorFitsSystemWindows(window, false)
 
         setContent {
             JetcasterTheme {

Jetcaster/app/src/main/java/com/example/jetcaster/ui/home/Home.kt

@@ -76,7 +76,7 @@ import com.example.jetcaster.util.ToggleFollowPodcastIconButton
 import com.example.jetcaster.util.constrastAgainst
 import com.example.jetcaster.util.quantityStringResource
 import com.example.jetcaster.util.rememberDominantColorState
-import com.example.jetcaster.util.statusBarPadding
+import com.example.jetcaster.util.statusBarsPadding
 import com.example.jetcaster.util.verticalGradientScrim
 import dev.chrisbanes.accompanist.coil.CoilImage
 import java.time.Duration
@@ -192,7 +192,7 @@ fun HomeContent(
                 Column(Modifier.fillMaxWidth()) {
                     HomeAppBar(
                         Modifier.fillMaxWidth()
-                            .statusBarPadding()
+                            .statusBarsPadding()
                             .preferredHeight(56.dp) /* TODO: change height to 48.dp in landscape */
                     )