Fix issue with an ambiguity when using Format with one value

ArgumentNullException for values was avoided as well, tests were written
Add position index validation for Insert.At action

Extend tests for Insert.At.From actions as well
Implement Remove.Starting action with tests
Implement Remove.Starting.From action with tests
Implement Remove.To action with tests
Implement Remove.To.From action with tests
Add exclusive/inclusive type comments
Update FluentAssertions
Separate Remove Starting and Remove To tests
Separate Remove Starting To tests
Implement Remove.Starting.From.To.From actions with tests
Implement Remove.StartingFirstOccurrence action with tests
Implement Remove.StartingFirstOccurrence.From action with tests
Implement Remove.StartingFirstOccurrence.IgnoringCase.From actions with tests