Create a simple CollageCanvas system, where elements can be created, …

[YodaForce157]

#54

Will create the underlying system for all Collage related visual building systems, such as a gui builder, screen builder, jei recipe widget builder, etc.

TODO:

• Create a basic canvas with elements that can be rendered
• Add element selection
• Add element dragging
• Handle canvas scaling/resizing
• Add a generated background/base texture, correctly sized and with an optional title space
• Add canvas changed event

This PR is currently inactive; Whilst it is a decently well-functioning feature currently, it still needs a lot of work done. Feel free to either pr into this pr or create a new pr for this feature. If you have any questions, feel free to message me on discord.

• Improve CollageElements to allow for different types via enums (allow custom ones too), and properties/options
• Decide exactly how to scale background based on provided image template
• Add a sidebar to display a selected element's properties
• Tidy up classes and method organisation - Rename all classes, packages and resources to descriptive names.
• Add drawer for different element types which can be dragged or placed onto the canvas
• Either, add a preview for placement of element, or allow for dragging of an element into the canvas
• Allow for generation of an image with elements on top
• Allow for more customization in the background generator, allowing for customization of the inventory gui.
• Create a way to generate/export a list of sizes and startX&startY values for use within a mod
• Create a collage for screens