Fixed toggle_snake_camel_pascal not handling single-word lowercase variables

[Anaminus]

I tried to toggle a variable named index to PascalCase, and found that it did nothing! This is because the variable is neither snake_case nor camelCase, but simply lower case with no separator. This fix treats lower-case-no-separator as camelCase so that it converts to PascalCase, which is more convenient than doing nothing at all.

[Anaminus]

Just considered something: if you're toggling multiple variables, they'll go out of sync:

foo     -> Foo    -> foo    -> Foo
foo_bar -> fooBar -> FooBar -> foo_bar

Obviously, the toggle function can't know the expected state of the single-word variable. At least, not without some complexity that's probably not worth implementing. The question is, might it actually be better to do nothing to the single-word variable?