That is, most of the business code should not be aware that it is being compiled
to multiple versions even when it heavily interacts with MC, preprocessor
statements should be an escape hatch, not the norm.
Similarly, code should not be forced to do `MCVer.getWindow(mc)` instead of the
much more intuitive `mc.getWindow()`, and a new preprocessor (technically remap)
feature makes this possible by defining "search and replace"-like patterns (but
smarter in that they are type-aware) in one or more central places (the
"Patterns.java" files) which then are applied all over the code base.
In a way, this is another step in the automatic back-porting process where
preprocessor statements are used when we cannot yet do something automatically.
Previously we "merely" automatically converted between different mapping, this
new feature now also allows us to automatically perform simple refactoring
tasks like changing field access to a getter+setter (e.g. `mc.getWindow()`), or
changing how a method is called (e.g. `BufferBuilder.begin`), or changing a
method call chain (e.g. `dispatcher.camera.getYaw()`), or most other
search-and-replace-like changes and any combination of those.
The only major limitation is that the replacement itself is not smart, so
arguments must be kept in same order (or be temporarily assigned to local
variables which then can be used in any order).
Basically the result of the Delombok function, except we use IntelliJ's equals,
hashCode and toString and don't re-organize imports (cause that breaks the
preprocessor) and a bunch of manual cleanup was necessary (and half the classes
weren't even converted).
Instead use NativeImage on 1.13+ via newly introduced Image class.
See Image docs for details.
Also fixes an issue with thumbnail taking on 1.13+: The original
ScreenshotHelper method is now async, luckily there's a sync
variant and as a bonus it directly returns a NativeImage so we can
skip having to read the screenshot from disk.
