Iris API/sun path rotation support

* Initial decorations changes

* Disable decorations by default

* Use custom rotation for decorations

* Add blend mode for decorations

This commit has breaking changes for the blend object.

* Fix testmod

* Add `showVanillaSky` decoration

This allows RP creators to blend on top vanilla's skybox if they desire, this commit also allows decorations to be rendered in every skybox.

* Fix typo

* Pre-render vanilla skybox

* Fix nothing rendering

* Attempt to sync sunrise/sunset to sun

* Add `overworld`/`end` skybox types

* Clean up

* Disable Iris compat

* Fix rotation precision

With older worlds and them having millions or billions of ticks, it does not precisely determine the proper rotation.

Fixes #83

* Fix documentation

* Initial rotation format improvement

* Remove `shouldRotate` property from `properties`

We can determine the rotation axes in the `rotation` object. By default all axes are set to `0` so they won't rotate at all.

* Fix tests

* Fix legacy deserializer

* Change decorations rotation to match skybox

* Rotation and decoration changes

* Flip static/axis rotation back

* Revert "Flip static/axis rotation back"

This reverts commit da0b810.

* Change fog appearance to match time declared in decorations

This commit makes fade times optional, if they are not specified nothing will be rendered; this means it disables the sky by default.

This commit fixes an issue where triangles render in the corners of the skyboxes under low render distances. This appears to be an vanilla issue which can be seen in the end sky with a render distance of 2 chunks.