Commands: Improve timer and showgif

[Dirain1700]

Whats changed:

Commands

• showgif: Allow to add shiny option (e.g. .showgif gc, shiny pikachu, pikachu)
• timer: support time prefixes (sec and min), like .timer 3 sec, 3 min (this returns 3 minutes and 3 seconds)
  This does not require to type seconds: just put the word starts with sec or min at last of params each.
• gtimer: Same with timer.
• sgtimer: Allow to use not integer numbers: like .sgtimer 1.5 min this command using same function with timer and gtimer, supports .sgtimer 1 min and 10 sec

Tools

• Add fromTimeString() function
  This outputs number with milliseconds from string, the params should end with the word starts with min or sec: doesnt allow hour or up. Allowing non-integer numbers, but disallowed numbers like 1+e7 and - + operators.