add converter [options] help

[cloud-66]

Where can i find which options converter support? For example there was some parameter like --from --to period time for converting specific period to flamegraph.

[apangin]

$ java -cp converter.jar jfr2flame
Usage: java jfr2flame [options] input.jfr [output.html]

options include all supported FlameGraph options, plus the following:
  --alloc       Allocation Flame Graph
  --live        Include only live objects in allocation profile
  --lock        Lock contention Flame Graph
  --threads     Split profile by threads
  --state LIST  Filter samples by thread states: RUNNABLE, SLEEPING, etc.
  --classify    Classify samples into predefined categories
  --total       Accumulate the total value (time, bytes, etc.)
  --lines       Show line numbers
  --bci         Show bytecode indices
  --simple      Simple class names instead of FQN
  --dot         Dotted class names
  --norm        Normalize names of hidden classes / lambdas
  --from TIME   Start time in ms (absolute or relative)
  --to TIME     End time in ms (absolute or relative)
  --collapsed   Use collapsed stacks output format

Specifically about time range:
#526 (comment)