Changelog for worldturtle-0.3.1.0

Changelog for turtle-haskell

Fixed longstanding bug where turtle rotation did not rotate at the advertised rate.
Fixed longstanding bug where rotation did not accept negative values gracefully.
Tweaked intial turtle rotation speed to 720 degrees/sec.
goto command now animates a transition.
Removed setPosition function.

Upgraded to lts-18.27.
Added runWorld' and runTurtle' variant commands which take a background color.
Deprecated setPosition.
Added jump, which is a variant of goto which never draws a line.
Added wait command, which is a TurtleCommand variant of sleep.
Added label and label' commands, which allows text to be drawn at turtle's position.
Added repeatFor method which is an alias for Control.Monad.replicateM_ (this is purely to help ease students into Monad concepts.)
TurtleCommand and WorldCommand are now instances of MonadIO.
Major internal performance improvements. SequenceCommand, is now a Coroutine. This reduces wasted calculations per-frame as the state of the previous frame can now be carried into the next frame of animation.
Removed WorldCommand as an instance of Control.Applicative and MonadPlus. This did not make sense in terms of parallelization. Instead, WorldComamnd is now an instance of MonadParallel
Introduced new >!> operator for parallel animations.
setPenDown has been split into setPenDown and setPenUp to be more LOGO-like.
setVisible has been split into setVisible and setInvisible to be more LOGO-like.
Added the labelwait-exe test.
Updated examples to account for command changes.
Removed spaceleak-exe test.

Upgrading upper bounds of the lens package to allow for compilation with GHC 9.0.1.
Regenerated .travis.yml to reflect new GHC supported version.

Upgrading to GHC 8.10.3 to resolve problems GHC compiler problems with Mac OSX. See here for details.
Fixed issue where newly drawn lines were drawn under older lines.

Split TurtleCommand into TurtleCommand and WorldCommand to help reduce boilerplate of having to apply a turtle to a command for every stage of a command block.
Added runWorld, runTurtle, run, and (>/>) functions.
circle command split into arc and circle commands.
Fixed shiftHue as function did not match documentation.

Added sleep function.
Added rotationSpeed function.
Added the shiftHue color function.
Fixed bugs in circle rendering when going in a clockwise direction.
Fixed the bounds and potential recursion pitfall in internal normalization functions.
If rotation left 270 degrees will not turn right 90 degrees and vice versa.

Initial release.