Refactor duplicated quoting code for XCode backend

XCode project file contains dictionary-like structures. Strings for the
mapped values have to be quoted if these include special characters.
Previously this quoting was happening in-place, before adding a new
value to the dictionary. This produce big amounts of boilerplate
error-prone code. For example if there are targets whose names contain special
characters (grpc++ in my case), produced file will be invalid.

This moves checking and quoting subroutine to the PbxDictItem class,
eliminating the need to do this on the caller side.

[Kin](https://github.com/Serchinastico/Kin) tool was used to validate
produced PBXProj files.

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