* removing $graphs global
* remove unused things
* fix some additional graphs
* Fix graphs persisting too soon
* correct name for poller module performance graph
* only one type of graph is used here
hopefully doesn't break anything
Mostly issues with snmp oids and options containing spaces. Try to remove all of those.
DO NOT DELETE THIS TEXT
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#### Testers
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* feature: Allow customisation of rrd step/heartbeat when creating new rrd files
* revert defaults
* added docs + webui config option
* Move RrdDefinition to an Object to make them easier to create and remove the possibility of typos.
* Fix style/lint issues and missing use statements
* 3 more missing use statements
* updated doc + moved schema file
Use data_update instead of rrd_update/rrd_create and influx_update
Centralize rrd file check so we can check against a remote rrdcached server too
Use rrd_name() to generate rrd file names
