Rename IOErrorEnum to IOError

[alatiera]

Also maybe we should rename this to IOError instead of IOErrorEnum... @bilelmoussaoui ?

Originally posted by @sdroege in #717 (comment)

[sdroege]

@alatiera Want to give it a try? I think this only needs 1-2 lines in Gir.toml

[alatiera]

From a quick look, its going to be a bit more involved than this. gir doesn't support renaming objects according to Bilal.

[bilelmoussaoui]

I will have a look at the gir side this weekend

[bilelmoussaoui]

Moving to 0.17 as this would require quiet a lot of changes from gir side

[sdroege]

I'll look at making this easy with the new gir that I'm slowly working on.