glTexImage2D support on GWT #7378
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This PR adds ability to upload bytes as texture with a call to glTexImage2D on gwt target,
Currently on gwt this call expects always int buffers, and if the size is 1, then it is assumed that the int is actually index of a pixmap.
Test was also added targeting lwjgl3 and gwt, to verify that glTexImage2d actually works and that pixmap functionality was not broken (i can check currently only on those two platforms).