An article on Strings in scripting language

[ivan-mogilko]

Write an article on strings in the Scripting Language section. There's a "String Formatting" article there, but the explanation of strings themselves, as types, seem to be missing.

Possible contents:

• types of strings: string literals, String object, legacy "string" type, what "const string" means (an advanced knowledge);
• special characters and escaping certain characters in strings;
• mention that you can format variables in string (link to Formatting page);
• mention that you may convert string to int and float (link to related String functions).