Bugfix: import function - undefined variable

Bugfix: added the loading of the static form data

Some bugfixes and some improvements

Removed the extern files, except the JSON file with the node descriptions, this will be loaded in offline mode too.

- fixed: clear selected nodes, works with several or all selected nodes (reason: two counting variables with the same name "i" where used in two nested loops)
- new: change node names (you can assign names to the nodes, these will be used as IDs if exported or re-imported to CPP (Arduino code)
- fixed: import merges imported nodes to existings ones, skipping nodes with the same name
- fixed: tooltips are now working, extracting the first paragraph of the HTML code
- new: nodes definition extracted to JSON file
- new: nodes help pages extracted to single HTML files
- new: form pages extracted to single HTML files
- new: asynchronous loading of JSON, help and form data, data will only be loaded when needed
- style: adapted the size of the palette, labels had been partially hidden

Import function for code from Arduino IDE

Small correction

corrected image link pathes

https://forum.pjrc.com/threads/31351-Teensyduino-1-26-Beta-3-Available?p=87620&viewfull=1#post87620

added mute_PCM() - sets or unsets VALID in VUCP (and adjusts PARITY)

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