StringExtensions methods and tests

- StringExtensions methods
- - public static bool CompareNoCase(this string valueCurrent, string
valueToCompare);

- - public static bool ContainedIn(this string valueCurrent, object[]
values);

- - public static bool ContainedIn(this string valueCurrent,
List<object> values);

- - public static bool ContainedIn(this string valueCurrent,
List<string> values);

- - public static bool EndsWithCurrent(this string valueCurrent, string
valueToCompare);

- - public static bool EndsWithOrdinalIgnoreCase(this string
valueCurrent, string valueToCompare);

- - public static string FormatCurrent(this string format, object arg0);

- - public static string FormatCurrent(this string format, object arg0,
object arg1);

- - public static string FormatCurrent(this string format, object arg0,
object arg1, object arg2);

- - public static string FormatCurrent(this string format, params
object[] args);

- - public static string FormatInvariant(this string format, object
arg0);

- - public static string FormatInvariant(this string format, object
arg0, object arg1);

- - public static string FormatInvariant(this string format, object
arg0, object arg1, object arg2);

- - public static string FormatInvariant(this string format, params
object[] args);

- - public static IEnumerable<int> IndexOfAll(this string valueCurrent,
string value);

- - public static int IndexOfCurrent(this string valueCurrent, string
value);

- - public static int IndexOfCurrent(this string valueCurrent, string
value, int startIndex);

- - public static int IndexOfOrdinalIgnoreCase(this string valueCurrent,
string value);

- - public static int IndexOfOrdinalIgnoreCase(this string valueCurrent,
string value, int startIndex);

- - public static string Join(this List<string> list, string separator);

- - public static string Join(this string[] array, string separator);

- - public static bool StartsWithCurrent(this string valueCurrent,
string valueToCompare);

- - public static bool StartsWithOrdinalIgnoreCase(this string
valueCurrent, string valueToCompare);