[Ohrrpgce] SVN: teeemcee/7718 When replaying an .ohrkeys, start by scanning it for its length in ticks

[subversion at HamsterRepublic.com]

teeemcee
2016-02-20 07:31:23 -0800 (Sat, 20 Feb 2016)
210
When replaying an .ohrkeys, start by scanning it for its length in ticks and ms.

The length in milliseconds is only an estimate.
Also, while replaying it, estimate the amount played back in ms in the same way.
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U   wip/allmodex.bas