Add more configuration options and example docker-compose

[oliviasculley]

Overview

This is a linked PR that improves configuration for more proposed FreeTAKServer-UI environment variables, and provides an example docker-compose.yml for these changes.

Changes

• Allows changing APPPORT to host FTS UI from a different port, if needed
• Allows setting APIPORT and APIPROTOCOL for the FTS UI to specify a different API uri, if needed
• Adds additional APIIP config variable to set a separate API ip for the FTS UI than the FTS IP. If no APIIP is specified, it will use the IP value, if specified
• Allows setting WEBMAPIP, WEBMAPPORT and WEBMAPPROTOCOL for the FTS UI, if needed

Related PRs

• Linked PR for FreeTAKServer-UI introducing more configuration options
• Linked PR for FreeTAKServer-User-Docs for these new variables

Issues

• Partially addresses Docker Compose #24

The example docker-compose.yml can be split out into a separate PR if need be. Please don't hesitate to give feedback or commentary on these changes. Thank you!