Fix: crash on startup when two recent files differ only in the drive letter

freadrequested to merge
fread/inkscape:drive-letter-fix into master

Hello,

Split paths now include the drive letter on Windows. The splitPath function doesn't process the path with Glib anymore. Instead it iterates over the bytes of the path in a simple loop. The new splitting behavior should be the same as !7027 (closed).

Fixes: #6028 (closed)

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