Extra string utility expressions

[TheBentoBox]

Description

It would be good to have a few more utility string expressions and improvements to existing ones. For example, an expression which returns text with just the first character capitalized, or the first character of each word. If we want to go fully customizable, the expression(s) should be able to:

• Return the same string with JUST the first letter capitalized.
• Return the same string with the first character of each word capitalized.
• Do both of the above with or without modifying the capitalization of all other characters.

Just som general suggestions:

1. In ExprStringCase the space between (upper|lower) and case should be optional as both spellings are correct. We should also support an additional pattern of (upper|lower)[ ]case %string%, and perhaps the expression could accept multiple strings. I'm sure users have previously assumed we don't have an upper/lowercase string expression because the current patterns are pretty lacking.
2. If I had to guess I'd personally expect capitalized %string% (which again could accept multiple strings) to return the string with only the first letter capitalized like discussed above. Right now it's just an alias for in upper case.
3. We could add another pattern (pascal|title) case[d] %string% which returns the string with the first letter in each word capitalized. On my server I have this same custom expression but as (|1¦lenient) pascal cased %string%, and if lenient (if parse mark is 1) it doesn't affect capitalization of letters other than the first ones. The same optional leniency could be applied to capitalized.