[PD] new object: [path] - following the example of [import]

[Hans-Christoph Steiner]

I just added a new object to Pd-extended: [path].  It allows you to append directories to the canvas-local path and have them active immediately.  Its basically [declare -path] but with the [import] interface and ability to take effect immediately.

Try it in tomorrow's builds and let me know if you think its useful.

.hc


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