Implement outline view mode (#401)

* Created wasm binding to action's of the radio buttons which control the view mode
Added entry to DocumentMessage Enum

* draw in wireframe mode by changing parameters on each shape
added functions/changed behavior to do as above
not working yet
   - newly added shapes should be drawn in wireframe
   - setting fill to "none" on a path does not only draw an outline
      - maybe the stroke width is 0?

* Wire frame view mostly functional for ellipses
   - Need to implement for all shapes
   - BUG: shapes don't immediatley update upon changing view-mode

* Fixed: active document now updates after view mode swap

* The Pros:
   - wire frame mode effects all shapes correctly

The Cons:
   - wire frame mode effects everything, including things that maybe shouldn't be, like select boxes and pen lines

* wire frame view no longer effects overlay layers

* Fixed: While in wireframe view the pen tool will draw regular thickness lines.

* some commenting

* Fixed potential bug:
   In layer/file system with a Folder layer with a sub-layer that is also
   a Folder cache_dirty must be set in order for all shapes to update properly

* refactored code to use ViewMode enum names throughout

* Changed: All wireframe lines are blank
cargo fmt

* Wireframe thickness doesn't change as a result of zooming
   - Added DocumentMessage::ReRenderDocument, which marks layers as dirty and renders with the updated render-string
   - All "zoom" messages in the movement_handler send a re-render message
   - while in wireframe view, the "render-transform" of all shapes includes the root layer transform

Added getter/setter methods for graphene::Document::view_mode

* cargo fmt

* wireframe now has proper thickness after "Zoom Canvas to Fit all" action

* Refactored
   - Changed FrontendMessage::UpdateCanvas to RenderDocument message to allow for lazy evaluation
   - Created DocumentOperation::SetViewMode to be more consistent with existing code
   - removed log statement
   - Added constants for empty fill and thin-black stroke

* cargo fmt

* Removed ReRenderDocument message

* cargo fmt

* Fixes as suggested by TrueDoctor

* clean up merge
cargo fmt

* Refactor:
   moved view_mode to DocumentMessageHandler

* Polishing

* changed those two comments

* Remove unknown todo comment

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

graphene/src/layers/folder.rs

@@ -1,6 +1,6 @@
 use glam::DVec2;
 
-use crate::{DocumentError, LayerId, Quad};
+use crate::{layers::style::ViewMode, DocumentError, LayerId, Quad};
 
 use super::{Layer, LayerData, LayerDataType};
 
@@ -15,9 +15,9 @@ pub struct Folder {
 }
 
 impl LayerData for Folder {
-	fn render(&mut self, svg: &mut String, transforms: &mut Vec<glam::DAffine2>) {
+	fn render(&mut self, svg: &mut String, transforms: &mut Vec<glam::DAffine2>, view_mode: ViewMode) {
 		for layer in &mut self.layers {
-			let _ = writeln!(svg, "{}", layer.render(transforms));
+			let _ = writeln!(svg, "{}", layer.render(transforms, view_mode));
 		}
 	}