Async set/get + Manually completable sync commands

• Added manually completable asynchronous set/get commands
• Updated asynchronous set/get commands
• Updated documentation

Sync set/get + Manually completable sync commands

• Added manually completable (terminable), synchronous set/get commands
• Updated synchronous set/get commands
• Updated documentation

QueueSafeSyncedValue + QueueSafeAsyncedValue

• added QueueSafeSyncedValue
• added QueueSafeAsyncedValue
• updated documentation and code comments

Highest priority + Priority queue

• actions renamed to commands
• added the ability to execute commands with highest priority
• updated code comments (documentation)
• command stack replaced with priority queue
• code cleaned and syntax improved

Async actions + Errors delivery + API Syntax + Documentation

• Updated API Syntax
• Added async actions
• Updated unit tests
• Updated documentation (comments in code & readme file)
• Added mechanism to deliver errors from the framework to developer/user

Syntax + Documentation + SwiftLint + GitHub action

• Updated API syntax
• Updated documentation
• Added SwiftLint integration
• Added GitHub action "Build & Test"

Updated API + Documentation

• Updated API
• Added documentation