put all global types into namespace "AssetStoreTools"

[JeReT]

Problem: "Image" class clashed with "UnityEngine.UI.Image"

Solution: Introduce a namespace (also fixed formatting for all cs files)

NOTE: I did not compile! Types in binaries are still without namespace!

[zwcloud]

Thanks! I will have a look at these later.

[JeReT]

Hey @zwcloud

I guess you didn't review yet because the immense amount of changes. Most of them are because my IDE converted all tabs to four spaces. Hope this doesn't break your coding conventions.

If not, you can easily skip this kind of changes by ticking "Hide whitespace" in the settings of the review: