v0.3.0

• Add auto-detection of targets from environment (variable, test-kitchen)
• Add !copy for cross-session copying
• Add !help and ? for usage in shell
• Add detailed help for commands
• Add output on copying files cross-session and editing/saving
• Add devcontainer for VSCode
• Change errors to be red, Shell built-in to yellow
• Fix handling of URL encoded parameters
• Fix list-transports to output all installed non-API transports
• Fix crashes on unexpected input in shell
• Fix exception handling in various places
• Fix missing binary in Gem