Another round of polishing (#101)

* Implement basic refactorings

* Simplify some match statements

* Rename `ix` to `index`

If we're not going with a single letter name,
then a full word makes more sense.

* Rename `as_hex` to `to_hex`

`as_` implies lossless reinterpretation
while the function does a conversion that loses information

* Replace `for_each` with for loops

for loops are a lot easier to read and maintain.

* factor out x and y coords in Line::render

this is arguably more ergonomic

* Remove redundant `format!(format_args!())`

client/web/wasm/src/document.rs

@@ -7,6 +7,7 @@ use wasm_bindgen::prelude::*;
 fn convert_error(err: editor_core::EditorError) -> JsValue {
 	Error::new(&err.to_string()).into()
 }
+
 mod mouse_state {
 	pub(super) type MouseKeys = u8;
 	use editor_core::events::{self, Event, MouseState, ViewportPosition};
@@ -35,6 +36,7 @@ mod mouse_state {
 		}
 	}
 }
+
 /// Modify the currently selected tool in the document state store
 #[wasm_bindgen]
 pub fn select_tool(tool: String) -> Result<(), JsValue> {