Less dependencies, more fixes

• Removed dependency from List::MoreUtils perl module
• Added more troubleshooting hints
• More bug fixes, see commits

- CHI, + omprog(rsyslog)

• CHI perl module not required anymore (switched to core module Storable)
• changed to using omprog(rsyslog) instead of exec for increased performance: see more here:
  http://www.rsyslog.com/doc/omprog.html
• fixed script that adds URLs to map in Zabbix 3.4 or newer
• extended troubleshooting section in README
• added more meaningful defaults to config file

NOTICE: if updating, make sure to update scripts as well as rsyslog configuration to make it work.

v2.0

Removed dependencies from JSON::RPC::Legacy::Client and Readonly modules
Added dependency on ZabbixAPI.pm (Included)