Rework buildSrc and remove usage of subprojects

buildSrc/src/main/kotlin/mihon.android.application.gradle.kts

@@ -0,0 +1,17 @@
+import mihon.buildlogic.AndroidConfig
+import mihon.buildlogic.configureAndroid
+import mihon.buildlogic.configureTest
+
+plugins {
+    id("mihon.code.detekt")
+    id("com.android.application")
+    kotlin("android")
+}
+
+android {
+    defaultConfig {
+        targetSdk = AndroidConfig.TARGET_SDK
+    }
+    configureAndroid(this)
+    configureTest()
+}