Strframework 1674

[sheenvempeny]

https://smartmobilefactory.atlassian.net/browse/STRFRAMEWORK-1674

Plist2Swift was not handling the optional variable (keys are not present in all the plists) inside a dictionary. This PR will fix that issue.

WAIT BEFORE MERGING

[rbugajewski]

Just some small typos, otherwise lgtm 👍🏻

[Tomusm]

@sheenvempeny I tested plist2Swift on the 3.0.1/master of the mac app.
It technically works, but It makes too much optionals.

For example here:

	internal struct EndPointAuthorize: EndPointAuthorizeProtocol {
		internal var absoluteURL: String? = "https://www.hidrive.strato.com/oauth2/authorize"
		internal var uRLFragment: String? = "login"
		internal var uRLParamResponseType: String? = "code"
		internal var uRLParamScope: String? = "admin,rw"
	}

	var endPointAuthorize: EndPointAuthorizeProtocol? {
		return EndPointAuthorize()
	}

Technically here, only var endPointAuthorize: EndPointAuthorizeProtocol? should be optional. The content of the struct does not have to in this case.
If we would add the "redirectURL" parameter from the staging, then only this redirectURL parameter would need to be optional since it"s not present on the live environment.
You can test plist2swift on the mac app master. It would be good if the update do not prevent the project to build.