Rename Context to EasyContext and View to EasyView for SwiftUI compatibility

[tcwalther]

SwiftUI introduces the structs View and Context. EasyPeasy's own structs of the same name conflict with this, which leads to errors in files where you include both SwiftUI and EasyPeasy.

This PR renames EasyPeasy's View and Context to EasyView and EasyContext. This fixes the incompatibility. I've decided not to rename file names, so Context.swift remains Context.swift, as that felt more in line with the other filenames.

[nakiostudio-bot]

Current coverage for EasyPeasy.framework is 96.21%

Files changed	-	-
Item+UIKit.swift	87.50%	✅
Item.swift	93.88%	✅
Attribute.swift	99.31%	✅
Context.swift	100.00%	✅

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[muukii]

IMO:
EasyPeasy module has struct EasyPeasy symbol. that is the actual problem.
Because we can't specify which symbol we needed to use by writing module name.
If struct EasyPeasy has been renamed, this PR's motivation might change.

What do you think? @tcwalther @nakiostudio