Reformat.
Move rr_flags() and rr_flags_for_init() to Flags.
Move DEFAULT_MAX_RBC/DEFAULT_MAX_EVENTS to Flags.
Rename syscallname() to syscall_name().
Rename statename() to state_name().
Introduce SyscallEntryOrExit and HasExecInfo enums and use where applicable.
Rename SignalEvent::no to 'number' for clarity.
Simplify and merge common code in rep_process_syscall_arch.
Rename SyscallEvent::no to SyscallEvent::number for clarity.
Rename event.h/.cc to Event.h/.cc.