Multiple DataTypes not saved if names of those started from a distinguish number, but the rest names are the same

[ReVoid]

If multiple datatypes of the same type with a name started from a number, the only one be created by uSync

How to reproduce:

1. Create several DataType of the same type.
   Textarea in my case
2. Name it like "1 some name", "2 some name" etc.
   Example in my case:
   
3. Check what uSync saves.
   Example in my case:
   
   (it is all that has been saved, nothing else)

Environment

Umbraco 8.6.1
uSync 8.6.1

[KevinJump]

yeah ☹️ looks like we use the internal Umbraco ToSafeFileName function which strips leading numbers - we do however have a function to handle file clashes, but we currently only use it on tree based items (like content) where the internal names can actually clash.
https://github.com/KevinJump/uSync8/blob/v8/dev/uSync8.ContentEdition/Handlers/ContentHandlerBase.cs#L58)

think we can safely move this up the bases classes so it's implemented on all items. (need to test that)

[KevinJump]

fixed for the next release,

workaround till then would be to use UseGuidFileNames setting (see docs) (this would require a clean export so the other files are removed)