* Allow extensions to set request bodies for GET and DELETE
Even though the semantics of request bodies for GET and DELETE are
undefined, it is legal to set request bodies for them. By default, GET
and DELETE form parameters should be encoded as URLs. If, however, an
extension defines `encodeParameters`, that should override the default
and set the request bodies for GET and DELETE methods, just like it does
for all the other HTTP methods.
* Don't use URL params by default with DELETE
* Re-enable skipped DELETE test
* Remove reference to DELETE in comment
* Add "useUrlParams" to requestConfig
* Add config.methodsThatUseUrlParams
* Add methodsThatUseUrlParams config tests
* Don't switch to body params based on extension
Native form handling submits repeated empty inputs as an array with an
empty value for each input, but htmx would only submit the first
non-empty input and any following inputs. Fix the value collection code
so that it correctly distinguishes between empty values and new inputs.
