Support String Dict files with `NSStringVariableWidthRuleType` about stringray HOT 2 OPEN

After more research on this NSStringVariableWidthRuleType in conjunction with the pluralization string format;
They do not operate together on the same key, NSStringLocalizedFormatKey always takes precedence and will be processed instead of NSStringVariableWidthRuleType if both are present.

Therefore a stringsdictentry can be either a pluralization format string or a variable width string.

Thinking the best solution for this is to provide a model that combines these two types together.
In the meantime, we can maybe just ignore NSStringVariableWidthRuleType entries until we can support both.

from stringray.

Only apple dev doc on stringsdict https://developer.apple.com/library/archive/documentation/MacOSX/Conceptual/BPInternational/StringsdictFileFormat/StringsdictFileFormat.html

It's old and outdated, and there is a related rdar for updating this doc: http://openradar.appspot.com/38627216

from stringray.