Nodered.py

- remove unnecessary code and comments.
- "palette" of "editor_theme" works properly.
- replace "index.js" file of launch directory.

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- change the order of arguments in function "start".
- add "start_browser" argument.
- remove "config.json" file after read config in Node-RED.
- remove unnecessary code and comments.
- update examples.
- fix bug on auth configs.

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- change node-red command arguments to config.json.
- add <a href="https://github.com/oyajiDev/NodeRED.py/blob/f5aff33113d2038f7a49cd61b233dbef1ea659dd/tests/server_test.py#L55">"auths"</a> options.

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- remove unnecessary code
- add "version", "description", "author", "keywords", "icon" to Node attributes.
- remove "nodered-py-" prefix from Node name.
- "nodered-py-" only attach to directory of Node.

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- add <a href="https://github.com/oyajiDev/NodeRED.py/blob/deea7530d6fcda9cdf6d76e9b5f827064de5722c/noderedpy/_nodered.py#L60">editorTheme</a>
- remove server.
- start Node-RED object directly.
- remove standalone server.
- pywebview integration is in <a href="https://github.com/oyajiDev/NodeRED.py/blob/master/tests/pywebview_test.py">tests</a>.

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- create "CodeProperty"
- "DictProperty" inherits "CodeProperty" with "json" language setting

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