Initial CoreID changes to allow code-based integration

LICENSE

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+@coreid/node-radius-server - CoreID maintained fork
+Copyright (C) 2021 Simon Tretter, Garrett Mills
+
+This program is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, either version 3 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+--
+
+Note: this is a fork of Simon Tretter's node-radius-server package
+modified for use in Starship CoreID. Per the terms of GPLv3, the
+modifications made are documented below:
+
+- Introduced the PackageInterface helper class
+    - enables integrating the library into code rather than as a
+      standalone CLI app
+
+- Modified existing code to use configuration on the PackageInterface
+  class instead of global imports
+
+- Modified existing code to log through PackageInterface.logger
+
+- Modified existing code to introduce a credentialMiddleware method
+  to IPacket, which allows external code to customize the credentials
+  before they are sent
+
+- Modified RadiusService to allow specifying a custom packet decoder
+  method on PackageInterface.
+
+- Modified UDPServer class to expose a stop() method