Java bindings: add BaseDataLoader, fixes and quirks for OffscreenMapRenderer

[matzf]

Add abstract BaseDataLoader to share the common logic for DataLoaders in Java and use this in the HttpDataLoader.
Remove the LocalDataLoader as it's never been used and seems redundant with the LocalDataProvider-option on the Tiled2dMapVectorLayerBuilder. With the BaseDataLoader, loading from resources can be easily added in
project-specific subclasses.

Extend the "quirks" (draw the frame repeatedly) to make the OffscreenMapRenderer work reliably again after rebasing these java bindings.

Premultiply Alpha in BufferedImageTextureHolder. Initialize texture with premultiplied alpha, as expected by shader.

github workflow: allow building & deploying the java library on untagged versions, to allow optionally pushing binary builds to the maven repository from feature branches etc. This workflow can be triggered from the github UI, but only once this is merged into the default branch of the repository (see workflow_dispatch).

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