Render adapters + Tiles loading

[mistic100]

Version 4.3 introduced the concept of adapters, those are modular pieces of code responsible of the render of the panorama in THREE.js, think about plugins but specialized to panorama rendering.

The adapters are :

• equirectangular : the standard render mode, included is the core JS file
• cubemap : previously in the code, it was externalized
• equirectangular-tiles : this is the new one

I am also working on a video adapter but currently facing performances issues.

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This system was developped to ease the integration of the equirectangular tiles adapter which allows to split huge panoramas into smaller files to get both better quality and better loading perfromances.

The documentation covers everything you need to know to use this new option.