Append ".~" to temp file name as file extension when its original file with no extension

Open username-removed-94717 requested to merge YueLinHo/tortoisegit:compare_wo_ext into master

This makes it possible to use external diff tool for comparing files with no extension.

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(C:\Program Files (x86)\WinMerge\WinMergeU.exe -s -e -x -ul -ur -wl -dl %bname -dr %yname %base %mine)

This may mitigate issue #2924 (closed):

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(WinMerge 2011)