* feat: --allow-command configuration restricts available atlantis commands
* add version and approve_policies into allow commands defaults
* allow-commands accept all keyword which allows all commands
* remove redundant nest
* more detail abount allow-commands all keyword
* Update server/events/comment_parser.go
* Moved CommandContext and CommandResult to models (#193)
* Moved CommandContext and CommandResult to models
* move from models to command
rename CommandContext -> Context
rename CommandResult -> Result
* moved command related helpers into command package
* move ProjectCommandContext and ProjectResult to command/project package
* move project command context and project result
* revert unrelated code
* move tests
* fix left over
* fix linting
* fix tests
* remove unused import
* fix project context dependencies
* fix depenedecies
* fix typo