Dracula Theme

Second (and hopefully final) beta release for Dracula v2. This release restructures the source files and introduces my first real foray into scripting to assist end-pack generation. But mostly the update just fixes some, admittedly rather silly, errors in the last beta:

• Fix new and old creative tab layouts getting mixed up.
• Add most 1.20.2 textures
• (hopefully) fix issues #8, #9, #10 and #11
• Restructure source files and add a generation script
• Improve vector asset consistency. This will be furthered on in the full release, along with templates for easy contributing.