Semi-encapsulated the core/api dependency graphs and created a proper structure to load eager singletons

briar-core/src/org/briarproject/system/SystemModule.java

@@ -0,0 +1,32 @@
+package org.briarproject.system;
+
+import org.briarproject.api.system.Clock;
+import org.briarproject.api.system.LocationUtils;
+import org.briarproject.api.system.SeedProvider;
+import org.briarproject.api.system.Timer;
+
+import dagger.Module;
+import dagger.Provides;
+
+@Module
+public class SystemModule {
+	@Provides
+	Clock provideClock() {
+		return new SystemClock();
+	}
+
+	@Provides
+	Timer provideTimer() {
+		return new SystemTimer();
+	}
+
+	@Provides
+	public SeedProvider provideSeedProvider() {
+		return null;
+	}
+
+	@Provides
+	public LocationUtils provideLocationUtils() {
+		return null;
+	}
+}