Allow parsing of more flexible interval strings including
long names (day, hour, minute, second, millisecond),
negative values, no spaces between components, and
throwing exceptions on invalid input if requested.
The following types are now allowed
- d|day|days
- h|hour|hours
- m|min|mins|minute|minutes
- s|sec|secs|second|seconds
- ms|msec|msecs|msecond|mseconds|millis|millisec|millisecs|millisecond|milliseconds
Also fix the milisecond parsing that was done completly wrong
the milliseoncds where just added after a "." as decimals without converting them at all.
Now the value is divided by 1000 and added to the existing number, and as before only if ms exist
The negative check is now included in the main parse regex, so a second regex check is no longer necessary
Spaces between values, before or anywhere are now more flexible.
Exceptions are thrown if the regex cannot parse anything, or it returns only one master entry and no matches
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