perf top: Stop using globals for tool state

	int		   freq;

	pid_t		   target_pid, target_tid;

	bool		   hide_kernel_symbols, hide_user_symbols, zero;

	bool		   system_wide;

	bool		   use_tui, use_stdio;

	bool		   sort_has_symbols;

	bool		   dont_use_callchains;

	bool		   kptr_restrict_warned;

	bool		   vmlinux_warned;

	bool		   inherit;

	bool		   group;

	bool		   sample_id_all_avail;

	bool		   dump_symtab;

	const char	   *cpu_list;

	struct hist_entry  *sym_filter_entry;

	struct perf_evsel  *sym_evsel;

	struct perf_session *session;

	struct winsize	   winsize;

	unsigned int	   mmap_pages;

	int		   default_interval;

	int		   realtime_prio;

	int		   sym_pcnt_filter;

	const char	   *sym_filter;

};

size_t perf_top__header_snprintf(struct perf_top *top, char *bf, size_t size);