* Added ImageRotate

* Quick rename of the example

* Update ImageRotate by changing doubles to floats and checking code convention

* Update API

* Add GenImageGradientSquare to allow square gradients

* Fix GenImageGradientSquare and add to textures_image_generation example

* Remove params from GenImageGradientSquare

* Replaced GenImageGradientH and GenImageGradientV with GenImageLinearGradient

* renamed GenImageLinearGradient to GenImageGradientLinear