Swift plugin templates

Just opening a PR so we can track progress.

- [x] Make Swift template
- [x] Make Swift template
- [x] Make Swift template

Here's the newest error caught from the system log
```
Sep 23 11:24:33 yamanji com.apple.xpc.launchd[1] (com.apple.xpc.launchd.domain.user.501): Attempt to re-bootstrap service from different path, will use existing: service = com.apple.CoreSimulator.CoreSimulatorService.110.2.1.Gf0StT5kYeAb, existing = /Applications/Xcode.app/Contents/Developer/Library/PrivateFrameworks/CoreSimulator.framework/Versions/A/XPCServices/com.apple.CoreSimulator.CoreSimulatorService.xpc, conflicting = /Applications/Xcode-Beta.app/Contents/Developer/Library/PrivateFrameworks/CoreSimulator.framework/Versions/A/XPCServices/com.apple.CoreSimulator.CoreSimulatorService.xpc
Sep 23 11:24:33 yamanji.local Xcode[39686]: WARNING: Failed to load plugin at path: "/Users/supermarin/Library/Application Support/Developer/Shared/Xcode/Plug-ins/SwiftPlugin.xcplugin", skipping. Error: Error Domain=NSCocoaErrorDomain Code=3587 "The bundle “SwiftPlugin” couldn’t be loaded because it is damaged or missing necessary resources." (dlopen_preflight(/Users/supermarin/Library/Application Support/Developer/Shared/Xcode/Plug-ins/SwiftPlugin.xcplugin/Contents/MacOS/SwiftPlugin): Library not loaded: @rpath/libswiftAppKit.dylib
	  Referenced from: /Users/supermarin/Library/Application Support/Developer/Shared/Xcode/Plug-ins/SwiftPlugin.xcplugin/Contents/MacOS/SwiftPlugin
	  Reason: image not found) UserInfo=0x7fecae45b000 {NSLocalizedFailureReason=The bundle is damaged or missing necessary resources., NSLocalizedRecoverySuggestion=Try reinstalling the bundle., NSFilePath=/Users/supermarin/Library/Application Support/Developer/Shared/Xcode/Plug-ins/SwiftPlugin.xcplugin/Contents/MacOS/SwiftPlugin, NSDebugDescription=dlopen_preflight(/Users/supermarin/Library/Application Support/Developer/Shared/Xcode/Plug-ins/SwiftPlugin.xcplugin/Contents/MacOS/SwiftPlugin): Library not loaded: @rpath/libswiftAppKit.dylib
	  Referenced from: /Users/supermarin/Library/Application Support/Developer/Shared/Xcode/Plug-ins/SwiftPlugin.xcplugin/Contents/MacOS/SwiftPlugin
	  Reason: image not found, NSBundlePath=/Users/supermarin/Library/Application Support/Developer/Shared/Xcode/Plug-ins/SwiftPlugin.xcplugin, NSLocalizedDescription=The bundle “SwiftPlugin” couldn’t be loaded because it is damaged or missing necessary resources.}
```