Fix some IDE warnings

[WaitingIdly]

changes in this PR:

• make a significant number of places use a pattern variable.
• fix accessoryType validation null check promptly throwing a NPE.
• sort modifiers so that @NotNull and @Nullable are just before the return type instead of on the line prior.
• add @Override annotations to methods missing them.
• replace "".equals(String) with String#isEmpty().
• use the canonical forms of floats (1.0f instead of 1f).
• fix a ObjectMapper.Builder having a field with the type TextureBinder instead of TextureBinder<T> when the only way to set it is via calling the method textureBinder(TextureBinder<T>).
• add a @NotNull annotation to the parameter of a method in the JeiPlugin.
• suppress ClassCanBeRecord warnings, as we have decided not to use those.
• suppress unchecked warnings for cases in which the entity class in a RecipeBuilder/removal.

basically all of these are just inspection stuff, with the exception of the fixing an NPE when validating accessoryType.