Use implementation instead of api.

This is recommended as a best practice, though AFAIK this only matters
for projects that are going to be imported by other projects.

For instance, you used to be able to include `:deps:extension-api` by
including any extension that depended on it. Now, every project that
wants to use `extension-api` has to include it directly. (Which is fine
because in practice, they all already do so.)

templates/android/template/app/build.gradle

@@ -83,8 +83,8 @@ android {
 }
 
 dependencies {
-	api fileTree(dir: 'libs', include: ['*.jar'])
-	::if (ANDROID_LIBRARY_PROJECTS)::::foreach (ANDROID_LIBRARY_PROJECTS)::api project(':deps:::name::')
+	implementation fileTree(dir: 'libs', include: ['*.jar'])
+	::if (ANDROID_LIBRARY_PROJECTS)::::foreach (ANDROID_LIBRARY_PROJECTS)::implementation project(':deps:::name::')
 	::end::::end::
 }
 

templates/android/template/build.gradle

@@ -58,6 +58,6 @@ configure(subprojects.findAll {!it.file('build.gradle').exists() && it.file('bui
 	}
 
 	dependencies {
-		api project(':deps:extension-api')
+		implementation project(':deps:extension-api')
 	}
 }

templates/extension/dependencies/android/build.gradle

@@ -17,5 +17,5 @@ android {
 }
 
 dependencies {
-	api project(':deps:extension-api')
+	implementation project(':deps:extension-api')
 }