KCL: Convert x/y lines to use keyword arguments (#5615)

Previously, `xLine`, `xLineTo`, `yLine` and `yLineTo` used positional arguments. Now:

- `xLineTo` and `yLineTo` have been removed
- `xLine` and `yLine` both use keyword arguments:
  - `length`, optional (i.e. a relative distance along the X or Y axis)
  - `endAbsolute` optional (i.e. an absolute point along the X or Y axis)
  - `tag` optional
- Exactly one of `length` or `endAbsolute` must be given. Not both, not neither.

For example:

```
// Old way
|> xLine(6.04, %)
|> yLineTo(20, %, $base)

// New way
|> xLine(length = 6.04)
|> yLine(endAbsolute = 20, tag = $base)
```

This also improves some of the general-purpose keyword arguments code in modeling app's TS codebase.

e2e/playwright/various.spec.ts

@@ -52,14 +52,14 @@ armThick = 0.5
 totalLen = 9.5
 part001 = startSketchOn('-XZ')
 |> startProfileAt([0, 0], %)
-|> yLine(baseHeight, %)
-|> xLine(baseLen, %)
+|> yLine(length = baseHeight)
+|> xLine(length = baseLen)
 |> angledLineToY({
       angle = topAng,
       to = totalHeightHalf,
     }, %, $seg04)
-|> xLineTo(totalLen, %, $seg03)
-|> yLine(-armThick, %, $seg01)
+|> xLine(endAbsolute = totalLen, tag = $seg03)
+|> yLine(length = -armThick, tag = $seg01)
 |> angledLineThatIntersects({
       angle = HALF_TURN,
       offset = -armThick,
@@ -70,15 +70,15 @@ part001 = startSketchOn('-XZ')
       angle = -bottomAng,
       to = -totalHeightHalf - armThick,
     }, %, $seg02)
-|> xLineTo(segEndX(seg03) + 0, %)
-|> yLine(-segLen(seg01), %)
+|> xLine(endAbsolute = segEndX(seg03) + 0)
+|> yLine(length = -segLen(seg01))
 |> angledLineThatIntersects({
       angle = HALF_TURN,
       offset = -armThick,
       intersectTag = seg02
     }, %)
 |> angledLineToY([segAng(seg02) + 180, -baseHeight], %)
-|> xLineTo(ZERO, %)
+|> xLine(endAbsolute = ZERO)
 |> close()
 |> extrude(length = 4)`
       )