Cleanup and rework build logic (#3113)

data/build.gradle.kts

@@ -1,17 +1,14 @@
 plugins {
-    id("mihon.library")
-    kotlin("android")
-    kotlin("plugin.serialization")
+    alias(mihonx.plugins.android.library)
+    alias(mihonx.plugins.spotless)
+
+    alias(libs.plugins.kotlin.serialization)
     alias(libs.plugins.sqldelight)
 }
 
 android {
     namespace = "tachiyomi.data"
 
-    defaultConfig {
-        consumerProguardFiles("consumer-rules.pro")
-    }
-
     sqldelight {
         databases {
             create("Database") {

data/proguard-rules.pro

@@ -1,21 +0,0 @@
-# Add project specific ProGuard rules here.
-# You can control the set of applied configuration files using the
-# proguardFiles setting in build.gradle.
-#
-# For more details, see
-#   http://developer.android.com/guide/developing/tools/proguard.html
-
-# If your project uses WebView with JS, uncomment the following
-# and specify the fully qualified class name to the JavaScript interface
-# class:
-#-keepclassmembers class fqcn.of.javascript.interface.for.webview {
-#   public *;
-#}
-
-# Uncomment this to preserve the line number information for
-# debugging stack traces.
-#-keepattributes SourceFile,LineNumberTable
-
-# If you keep the line number information, uncomment this to
-# hide the original source file name.
-#-renamesourcefileattribute SourceFile