Bump Minimum SDK to API 18 (KitKat)

Support for Jelly Bean has been gone the moment we update NDK toolchain version. See #279 for the rational on this change.

app/build.gradle

@@ -10,7 +10,7 @@ android {
         applicationId project.properties["app.application_id"]
         versionCode project.properties["app.version_code"].toInteger()
         versionName project.properties["app.version_name"]
-        minSdk 16
+        minSdk 18
         compileSdk 34
         targetSdk 34
         

love/build.gradle

@@ -10,7 +10,7 @@ android {
     ndkVersion '25.2.9519653'
 
     defaultConfig {
-        minSdk 16
+        minSdk 18
         compileSdk 34
         targetSdk 34
         externalNativeBuild {