Optimization: Get the colorpixels when loading configuration, make use of the new config struct

Instead of building arrays of colorpixels we can simply use a pointer
to a struct Colortriple. Furthermore, by getting the colorpixels when
loading the configuration, we save a lot of function calls in the
main code.

src/mainx.c

@@ -112,10 +112,10 @@ int main(int argc, char *argv[], char *env[]) {
         memset(&evenths, 0, sizeof(xcb_event_handlers_t));
         memset(&prophs, 0, sizeof(xcb_property_handlers_t));
 
-        load_configuration(override_configpath);
-
         conn = xcb_connect(NULL, &screens);
 
+        load_configuration(conn, override_configpath);
+
         /* Place requests for the atoms we need as soon as possible */
         #define REQUEST_ATOM(name) atom_cookies[name] = xcb_intern_atom(conn, 0, strlen(#name), #name);