Migrate from OSA 5.x to OSA 6.0

There aren't any major breaking changes. Your current scenes/prefabs shouldn't be affected if you closely follow this guide.

0. Minimum Unity version increased from 2017.4.3f1 to 2018.4.34f1. Make sure you have this version or a newer one.
1. Backup
2. Delete old OSA folder completely (by default, located in Assets/Plugins/Com.ForbiddenByte/OSA) (Important)
3. Import the new package
4. If you previously imported the Utils, Demos or any other sub-package, re-import them now.
5. If you previously referenced the OSA assembly definition, now note that we renamed it to OSA.Core, so make sure to update your references. 
   Also, most of the non-essential utilities were moved to their own OSA.Utilities asemdef, so if compile errors show, try referencing this as well before investigating deeper.
6. If using Playmaker
	6.1 Import PMSupport-Unity2017-1-f3.unitypackages
	6.2 If you've previously imported DataMakerXMLTemplates-Unity2017-1-f3, import the newer one now
7. It's highly recommended to check the <a href="https://forbiddenbyte.com/unityassetstore/optimizedscrollviewadapter/Changelog.txt">Changelog</a>, especially the "Breaking changes" section for more details.