Move each xml of template in into its own subdir and apply small template fixes

Then in Bitbucket each template can have its own README.md rendered when viewed in web.
Based on user feedback received through forum and telegram implement small changes listed below:
(1) rename value mapping 'Ethernet 10Mbs' to 'Ethernet' in linux,linux_prom
(2) added ploop md hcp zram to LLD filter for vfs.dev(block devices) in linux,linux_prom,linux_snmp
(3) removed not used macros in hp_hpn template
(4) fix value mapping for HH3C template
(5) change poll time of CPU metrics to 5m by default in cisco template
(6) add missing user macros in windows_agent template
(7) remove mode=none from trigger prototypes, version triggers now close after some timeout
(8) set all screens graphs width to 750px