[enh] plugin support basics ++ self ip plugin

searx/plugins/self_ip.py

@@ -0,0 +1,17 @@
+
+name = "Self IP"
+description = ""
+default_on = True
+
+
+def pre_search(request, ctx):
+    if ctx['search'].query == 'ip':
+        x_forwarded_for = request.headers.getlist("X-Forwarded-For")
+        if x_forwarded_for:
+            ip = x_forwarded_for[0]
+        else:
+            ip = request.remote_addr
+        ctx['search'].answers.clear()
+        ctx['search'].answers.add(ip)
+        return False
+    return True