In AHK, a function is anything callable. A method is a function attached to an object. In short, all methods are functions, but not all functions are methods.

Previously, AHK++ referred to all functions as methods. This PR changes that for both user-facing and internal references wherever the change is non-breaking. Settings have not been renamed as that would be breaking. Some mentions may have been missed and will be cleaned up later.

This also changes the document outline slightly. All functions are now reported as functions instead of methods. This is true even if the function is a method. This may break tools that depended on symbols being reported as methods, but AHK++ is not designed to support those tools, and that behavior was incorrect, so this is not a breaking change.

Really, the only change is that it now says function where it used to say method:

Some themes may have a different icon for functions vs methods, but the Default Dark+ theme does not.