Dump `proguard-android-optimize.txt` into local configuration for later modification

This was achived by:

* Adding `-printconfiguration r8.txt` to `proguard-rules.pro`
* Copying the part from start of `r8.txt` to before the `-printconfiguration` line into its own file.

This gets us exactly what was used in the bundled version.

app/build.gradle

@@ -44,7 +44,7 @@ android {
     def releaseTemplate = {
         shrinkResources true
         minifyEnabled true
-        proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
+        proguardFiles 'proguard-android-optimize-3.5.0-modified.txt', 'proguard-rules.pro'
         matchingFallbacks = ['release'] // Use on the "release" build type in dependencies (AARs)
     }
 

app/proguard-android-optimize-3.5.0-modified.txt

@@ -0,0 +1,121 @@
+####################################################################################################
+# Copy of `proguard-android-optimize.txt`.
+# We need to _remove_ some of the configuration, so the only way to achieve that is to dump it here
+# and modify it.
+####################################################################################################
+
+# This is a configuration file for ProGuard.
+# http://proguard.sourceforge.net/index.html#manual/usage.html
+#
+# Starting with version 2.2 of the Android plugin for Gradle, this file is distributed together with
+# the plugin and unpacked at build-time. The files in $ANDROID_HOME are no longer maintained and
+# will be ignored by new version of the Android plugin for Gradle.
+
+# Optimizations: If you don't want to optimize, use the proguard-android.txt configuration file
+# instead of this one, which turns off the optimization flags.
+# Adding optimization introduces certain risks, since for example not all optimizations performed by
+# ProGuard works on all versions of Dalvik.  The following flags turn off various optimizations
+# known to have issues, but the list may not be complete or up to date. (The "arithmetic"
+# optimization can be used if you are only targeting Android 2.0 or later.)  Make sure you test
+# thoroughly if you go this route.
+-optimizations !code/simplification/arithmetic,!code/simplification/cast,!field/*,!class/merging/*
+-optimizationpasses 5
+-allowaccessmodification
+
+-dontusemixedcaseclassnames
+-dontskipnonpubliclibraryclasses
+-verbose
+
+# Preserve some attributes that may be required for reflection.
+-keepattributes *Annotation*,Signature,InnerClasses,EnclosingMethod
+
+-keep public class com.google.vending.licensing.ILicensingService
+-keep public class com.android.vending.licensing.ILicensingService
+-keep public class com.google.android.vending.licensing.ILicensingService
+-dontnote com.android.vending.licensing.ILicensingService
+-dontnote com.google.vending.licensing.ILicensingService
+-dontnote com.google.android.vending.licensing.ILicensingService
+
+# For native methods, see http://proguard.sourceforge.net/manual/examples.html#native
+-keepclasseswithmembernames class * {
+    native <methods>;
+}
+
+# Keep setters in Views so that animations can still work.
+-keepclassmembers public class * extends android.view.View {
+    void set*(***);
+    *** get*();
+}
+
+# We want to keep methods in Activity that could be used in the XML attribute onClick.
+-keepclassmembers class * extends android.app.Activity {
+    public void *(android.view.View);
+}
+
+# For enumeration classes, see http://proguard.sourceforge.net/manual/examples.html#enumerations
+-keepclassmembers enum * {
+    public static **[] values();
+    public static ** valueOf(java.lang.String);
+}
+
+-keepclassmembers class * implements android.os.Parcelable {
+    public static final ** CREATOR;
+}
+
+-keepclassmembers class **.R$* {
+    public static <fields>;
+}
+
+# Preserve annotated Javascript interface methods.
+-keepclassmembers class * {
+    @android.webkit.JavascriptInterface <methods>;
+}
+
+# The support libraries contains references to newer platform versions.
+# Don't warn about those in case this app is linking against an older
+# platform version. We know about them, and they are safe.
+-dontnote android.support.**
+-dontnote androidx.**
+-dontwarn android.support.**
+-dontwarn androidx.**
+
+# This class is deprecated, but remains for backward compatibility.
+-dontwarn android.util.FloatMath
+
+# Understand the @Keep support annotation.
+-keep class android.support.annotation.Keep
+-keep class androidx.annotation.Keep
+
+-keep @android.support.annotation.Keep class * {*;}
+-keep @androidx.annotation.Keep class * {*;}
+
+-keepclasseswithmembers class * {
+    @android.support.annotation.Keep <methods>;
+}
+
+-keepclasseswithmembers class * {
+    @androidx.annotation.Keep <methods>;
+}
+
+-keepclasseswithmembers class * {
+    @android.support.annotation.Keep <fields>;
+}
+
+-keepclasseswithmembers class * {
+    @androidx.annotation.Keep <fields>;
+}
+
+-keepclasseswithmembers class * {
+    @android.support.annotation.Keep <init>(...);
+}
+
+-keepclasseswithmembers class * {
+    @androidx.annotation.Keep <init>(...);
+}
+
+# These classes are duplicated between android.jar and org.apache.http.legacy.jar.
+-dontnote org.apache.http.**
+-dontnote android.net.http.**
+
+# These classes are duplicated between android.jar and core-lambda-stubs.jar.
+-dontnote java.lang.invoke.**