fix: should use file descriptor as index for bitvec array.
fix: maximum receivable event size is INT_MAX. and, do not need to use the bit64vec to confirm the sentry is registered.
fix: should use snake case as name convention consistently.
fix: should release reference of sentry manually if one-shot event.
change: bit64vec.h has been removed.
change: lep_sentry_dealloc_gc has been added.
fix: forgot to rename refFn of lep_loop_t structure to snake case.
fix: should check the value range of passed fd argument.
change: loop argument check redundant code has been refactored.