Use ordinal string comparisons

[ghost]

Please DO NOT LINK / ATTACH YOUR PROJECT FILES HERE

Describe the issue We have noticed some string calls (IndexOf, StartsWith, ToLower etc.) in the C# source that do not pass a StringComparison argument and thus use culture-specific comparison, but they should really be using ordinal comparison (StringComparison.Ordinal) instead to avoid issues on devices set to a non-English locale.

[MorrisRH]

We'll look into improving this but if a specific comparison is causing you issues please let us know.