Simple Custom Early Loading

Added exception handling when the initialization of the neoforge early window fails (e.g. due to invalid options file). This should allow the game to proceed to start with the early window somehow initialized to default values. Thanks to Samsterbam and Piotr1628 for reporting it and helping with investigating the issue #7.

Added an option to specify multiple images from which a random one will be picked. Example: "image": ["stellarview.png", "another.png", "yet_another.png"], Thanks to Gabriel fresan for the suggestion #6!

Added support for window resizing. The resolution will now update when the window is resized. Updated image rendering to keep aspect ratio. This can be disabled with "keep_aspect_ratio": false, in the position element section. This also resolves an issue where a black strips would display when the window switched to fullscreen, thanks to pitersonix for reporting!