* extended staticmap capabilities
* added allowRemoteMarkerIcons configuration option and restricted fetching of remote marker icons only when option is set to true;
asynchronously load all available icons in a settings object on server startup;
replaced fs.existsSync() call in serve_rendered when drawing marker icons with a check against available icons settings object;
* updated documentation for linecap parameter in staticmaps endpoint;
added linejoin parameter to staticmaps endpoint;
* added capability of staticmap endpoint to draw multiple paths
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