Fixed the issue with import/export save not working on Chrome/Edge.

For the most part, this should not affect gameplay. However, since the new export save function for web builds does not work well with the old JSON format, I've had to change it to Base64 instead. Old export codes from previous versions of the game will still work with the latest version, but new export codes generated in v1.1.0  or later will not work in v1.0.1 or older builds.

As for the windows builds, since the judging period of Zombie Girl Game Jam is still ongoing, I have left the version from before the jam deadline (v1.0.1) still available for download, and renamed it to "zombielf-win(jam deadline version).zip", while also including the latest version, which is named "zombielf-win-latest.zip".

Special thanks to TinyTakinTeller for helping and guiding me through this whole process. While this might seem like a small update, it was certainly not easy (for me at least, this being my first attempt at making a Godot game and all), and I could not have done it without them. Their own game, A Dark Forest, was also one of the inspirations behind Zombielf, and I highly recommend it!