Add Validation Functions

[Fleshgrinder]

It would be great to have functions with which it is possible to verify if a given string is in an expected case format, or not. These functions can then be used with Kotlin's require and check functions as needed.

public fun String.isUpperCaseFormat(separator: Char, vararg ignore: Char): Boolean
public fun String.isUpperCamelCase(vararg ignore: Char): Boolean
public fun String.isUpperDashCase(vararg ignore: Char): Boolean
public fun String.isUpperSnakeCase(vararg ignore: Char): Boolean

public fun String.isLowerCaseFormat(separator: Char, vararg ignore: Char): Boolean
public fun String.isLowerCamelCase(vararg ignore: Char): Boolean
public fun String.isLowerDashCase(vararg ignore: Char): Boolean
public fun String.isLowerSnakeCase(vararg ignore: Char): Boolean