Feature request: API clear output folder

[taminhluan]

It seems there is no way to clear output folder before use ogr2ogr.
In my case: I want to use ogr2ogr multiple times. But every time using ogr2ogr the output files will be remained in output folder
For example: Using ogr2ogr to convert a.geojson to a.kml. ==> The output folder will be: ['a.kml']
Then convert b.geojson to b.kml ==> The output folder will be ['a.kml', 'b.kml'].

It will be really nice to have the api like: .clearOutputFolder().

BTW: Your work is awesome. Thank you for your effort.