golang common facilities lib
- hot reload mechanism in server pkg
- tweak performance of cache.LruCache
- merge mutexmap with cmap, lur cache will be sharded
- merge pqueue and gopqueue for priority queue
- merge recycler and slab pkg
- str pkg StringBuilder for better performance
- shard lru cache to lower mutex race
- replace lru cache container/list with slice
- https://github.com/dgryski/go-clockpro