Implement the Brush tool (#1099)

* Implement Brush Node

* Add color Input

* Add VectorPointsNode

* Add Erase Node

* Adapt compilation infrastructure to allow non Image Frame inputs

* Remove debug output from TransformNode

* Fix transform calculation

* Fix Blending by making the brush texture use associated alpha

* Code improvements and UX polish

* Rename Opacity to Flow

* Add erase option to brush node + fix freehand tool

* Fix crash

* Revert erase implementation

* Fix flattening id calculation

* Fix some transformation issues

* Fix changing the pivot location

* Fix vector data modify bounds

* Minor fn name cleanup

* Fix some tests

* Fix tests

---------

Co-authored-by: Keavon Chambers <keavon@keavon.com>
Co-authored-by: hypercube <0hypercube@gmail.com>

node-graph/gcore/src/ops.rs

@@ -23,7 +23,7 @@ pub struct AddParameterNode<Second> {
 }
 
 #[node_macro::node_fn(AddParameterNode)]
-fn flat_map<U, T>(first: U, second: T) -> <U as Add<T>>::Output
+fn add_parameter<U, T>(first: U, second: T) -> <U as Add<T>>::Output
 where
 	U: Add<T>,
 {