added PDH_FMT_NOCAP100 format option

closes #2483

closes #1763
closes #2017

Typo

closes #1425

1. in prometheus client, do not check for invalid characters anymore,
because we are already replacing all invalid characters with regex
anyways.
2. in win_perf_counters, sanitize field name _and_ measurement name.
Also add '%' to the list of sanitized characters, because this character
is invalid for most output plugins, and can also easily cause string
formatting issues throughout the stack.
3. All '%' will now be translated to 'Percent'

closes #1430

Replace '/[sS]ec' for '_persec' and spaces with underscores.

closes #1118

Network metrics are pretty important and the block adds a couple with a link to the names for more. This adds a block with a few counters to the Generic Queries examples in plugins/inputs/win_perf_counters/README.md

wherein missing performance counters caused it to return
early from the loop, instead of ignoring missing in
default configuration mode.

closes #625

Fix memory leak: Remove signal.Notify code from plugins/inputs/win_perf_counters.(*Win_PerfCounters).Gather

percentage characters in sampleConfig string so that fmt.Printf
will interpret them as literal percentage characters when
running 'telegraf.exe -sample-config'

closes #620

closes #575