Refactor lidar library: rename olei_config to lidar_config, add nanoscan example and shared byte helpers

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

examples/sick_example.cpp

@@ -1,7 +1,4 @@
-// sick_example.cpp — quick try-out of the SICK TiM driver (SOPAS/CoLa-A, TCP)
-//
-// Verified against a real SICK TiM781S — see the caveat in
-// include/lidarlib/sick_lidar.hpp for exactly what was (and wasn't) confirmed.
+// SICK TiM driver example (SOPAS/CoLa-A, TCP).
 #include "lidarlib/sick_lidar.hpp"
 #include <cstdio>