Request: add a createShader( String [] vertSrc, String [] fragSrc ) function like p5.js has

Created by: scudly

Now that we have multi-line strings, it is practical to include shader code directly in sketches (or even to construct them programmatically) rather than reading from an external file. The current publicly supported and documented loadShader() API only cleanly supports reading shaders from files. Ideally, we would also have a createShader( String[] fragSrc ) that infers the type and provides a vertex shader as the current loadShader() does.

Passing the source as an array of strings seems more general than taking it as a single, multi-line string and is trivial enough to express in code. It also matches the existing PShader constructors.

Comienza revisando la API documentada de loadShader() y los constructores existentes de PShader, ambos mencionados en el issue. Compara cómo gestionan las fuentes de los shaders y los valores predeterminados del vertex shader. El trabajo estará terminado cuando los sketches puedan construir shaders a partir de fuentes String[] tanto para la forma explícita vertex/fragment como para la forma inferida descrita en la solicitud.