Allow bare identifiers as the RHS of comparisons in ppp:if conditions
(e.g., `<ppp:if var1 contains var2>`). The grammar now accepts IDENTIFIER
as an alternative to SIMPLEVALUE, and __eval_basiccondition resolves
bare identifier values as variable references before comparison.
* added "$$" to end of parameters as first choice in a wildcard, to avoid confusion with a choice that could be considered parameters.
* additional fixes in the parser.
* Mapping of extranetworks through the new command. This allows you to use a "virtual" extranetwork that is converted to a real one depending on conditions, like the model kind/variant.
* Fixed a parsing bug with the if command.
* Some refactoring and additional checks.
* Enhance PromptPostProcessorComfyUINode to return variables.
* New PromptPostProcessorSelectVariableComfyUINode for selecting variables.
* Fixed detection of Flux Schnell in Forge.
* Improved documentation.
Brandon Wallace