Misc fixes

[AlexWinder]

Adds a number of fixes and improvements.

• Fixed false positive on in-use ports whereby ephemeral ports are shown up, for example 54321 is showing in use when it should be 5432.
• Fixed assumption of docker-compose in some places.
• Removed clear commands so that any log messages won't be hidden.
• Converted the CHANGELOG to markdown and added old versions.
• Improvements to README, markdown, better commands, grammar, punctuation, spelling.
• Testing against TAK Server 4.8.