Rework Plot Axes (#479)

Some cleanup of the axis drawing code. More refactoring should follow,
but in a follow-up PR.

Axis styling documentation is not good yet!
New features:
- Per axis coloring for scientific plots
- Axis padding for both scientific and school-book plots
- Axis "overshoot" for school-book plots
- Customizable axis, tick and grid z-layer
- One can disable the shared "0" tick

I am not happy with the shared "0" tick drawing, this should get
improved!

CHANGES.md

@@ -7,8 +7,11 @@
 - Open arcs are no longer modified for anchors, invalid border anchors will panic.
 - Grids now actually support border anchors.
 
-## Plot
-- Fixed annotation bounds calculation
+## Libs
+### Plot
+- The default style of plots changed
+- New style keys for enabling/disabling the shared zero tick for "school-book" style plots
+- New style keys for specifying the layer of different plot elements (`grid-layer`, `axis-layer`, `background-layer`)
 
 ## Misc
 - The `hide` function now support an additional `bounds:` parameter to enable canvas bounds adjustment for hidden elements

manual.typ

@@ -741,8 +741,10 @@ Axis names to be used for styling:
   - `bottom`: X-Axis
   - `top`: X2-Axis
 
+#doc-style.parse-show-module("/src/lib/axes.typ")
+
 ==== Default `scientific` Style
-#raw(repr(axes.default-style))
+#raw(repr(axes.default-style-scientific))
 
 ==== Default `school-book` Style
 #raw(repr(axes.default-style-schoolbook))