added Seafile task
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ShareX.UploadersLib/UploadersConfig.cs
added Seafile configuration properties
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ShareX.UploadersLib/Forms/UploadersConfigForm.resx
ShareX.UploadersLib/Forms/UploadersConfigForm.Designer.cs
ShareX.UploadersLib/Forms/UploadersConfigForm.cs
added Seafile tab, settings, and relevant configuration & validation utilities
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ShareX.UploadersLib/FileUploaders/Seafile.cs
main Seafile controller class, watch out for the ShareURL class as it doesn't used shared http classes due to contentlength and postdata PUT constraints