Support specifying API endpoins via java props

- Add support fo specifying runelite.session.url java prop to be used
instead of RuneLite session base
- Add support fo specifying runelite.http-service.url java prop to be used
instead of RuneLite api base url
- Add support fo specifying runelite.ws.url java prop to be used
instead of RuneLite websocket url
- Add support for specifying runelite.static.url java prop to be used
instead of RuneLite s.r.n url

Signed-off-by: Tomas Slusny <slusnucky@gmail.com>

http-api/src/main/java/net/runelite/http/api/RuneLiteAPI.java

@@ -97,21 +97,49 @@ public class RuneLiteAPI
 
 	public static HttpUrl getSessionBase()
 	{
+		final String prop = System.getProperty("runelite.session.url");
+
+		if (prop != null && !prop.isEmpty())
+		{
+			return HttpUrl.parse(prop);
+		}
+
 		return HttpUrl.parse(BASE + "/session");
 	}
 
 	public static HttpUrl getApiBase()
 	{
+		final String prop = System.getProperty("runelite.http-service.url");
+
+		if (prop != null && !prop.isEmpty())
+		{
+			return HttpUrl.parse(prop);
+		}
+
 		return HttpUrl.parse(BASE + "/runelite-" + getVersion());
 	}
 
 	public static HttpUrl getStaticBase()
 	{
+		final String prop = System.getProperty("runelite.static.url");
+
+		if (prop != null && !prop.isEmpty())
+		{
+			return HttpUrl.parse(prop);
+		}
+
 		return HttpUrl.parse(STATICBASE);
 	}
 
 	public static HttpUrl getWsEndpoint()
 	{
+		final String prop = System.getProperty("runelite.ws.url");
+
+		if (prop != null && !prop.isEmpty())
+		{
+			return HttpUrl.parse(prop);
+		}
+
 		return HttpUrl.parse(WSBASE);
 	}