[Ohrrpgce] SVN: teeemcee/11521 Fix gh#36: renamefile on Windows should work even when another program i

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teeemcee
2019-12-28 18:38:42 -0800 (Sat, 28 Dec 2019)
228
Fix gh#36: renamefile on Windows should work even when another program is accessing the files

I use both workaround strategies of falling back to copy+delete and trying
multiple times, so this should hopefully be really robust.
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U   wip/filelayer.cpp
U   wip/os_windows.bas
U   wip/util.bas