Info about support, compatibility, deprecation and removal

OTP-15140

* sverker/ets-count/OTP-14987:
  erts,stdlib: Improve docs about obsolete ets_limit
  erts: Reduce test log noise from ets_SUITE
  erts: Increase scalability of ets name lookup
  erts: Rename one of delete_trap to select_delete_trap
  erts: Refactor usage of am_atom_put to ERTS_MAKE_AM
  erts: Add system_info(ets_count)
  erts: Fix narrow race between ets:new and ets:delete

* siri/logger-fix:
  Update documentation of logger and error_logger
  Change type name logger:log() to logger:log_event()
  Update preloaded
  Update primary bootstrap
  Rename module logger_simple to logger_simple_h
  Change env var logger_log_progress to logger_progress_reports
  Remove HandlerId from handler callback functions and add it to Config
  Change handler id for sasl handler from sasl_h to sasl
  Change Compare parameter to logger_filters:domain/2
  Update Logger documentation
  Rename reset_module_level to unset_module_level
  Allow chars_limit to limit strings
  Add logger:update_formatter_config/2,3
  Set legacy_header=true for kernel's default handler only
  Improve documentation of logger and error_logger
  Use system_time instead of monotonic_time as timestamp in logger