feat(api): bump ImPlot from 2023-era 1f7a8c0 to v1.0; migrate to ImPlotSpec

Upstream implot v1.0 (https://github.com/epezent/implot/releases/tag/v1.0)
is a breaking release that replaces per-call (flags, offset, stride) args
on every Plot* function with a single ImPlotSpec value-type, and removes
the SetNextX-style helpers. The headline new feature is per-index colors
and marker sizes via ImPlotSpec arrays (PR epezent/implot#672).

Binding changes:
- Advance include/implot submodule 1f7a8c0 -> v1.0 (524f9fc)
- Regenerate ast-implot.json
- Add ImPlotSpec: scalar @BindingField props plus hand-written native
  setters for the 5 array-pointer fields (LineColors, FillColors,
  MarkerSizes, MarkerLineColors, MarkerFillColors). Backing buffers are
  owned in native memory (ImGui::MemAlloc) and freed on destroy() or
  on reassignment.
- Rewrite every Plot* signature: the (flags, offset, stride) tail is
  replaced by `@OptArg @ArgValue(callPrefix="*") ImPlotSpec spec`,
  which marshals to `*reinterpret_cast<ImPlotSpec*>(spec.ptr)` at the
  C++ call site. Progressive-cutoff overloads still expose spec-less
  variants (relying on C++ default `= ImPlotSpec()`).
- Add PlotPolygon, PlotBubbles, NextMarker (new in v1.0)
- Remove SetNextLineStyle / SetNextFillStyle / SetNextMarkerStyle /
  SetNextErrorBarStyle (obsoleted in v1.0 -- configure ImPlotSpec
  instead)
- Trim ImPlotStyle: drop LineWeight/Marker/MarkerSize/MarkerWeight/
  FillAlpha/ErrorBarSize/ErrorBarWeight/DigitalBitHeight/
  DigitalBitGap (all moved into ImPlotSpec); add new
  DigitalPadding/DigitalSpacing
- Flag enums shift accordingly: ImPlotMarker_None is now -2
  (ImPlotMarker_Auto = -1 is new); ImPlotCol drops the 5 per-item
  entries (Line/Fill/MarkerOutline/MarkerFill/ErrorBar);
  ImPlotStyleVar drops the 9 matching vars; ImPlotLegendFlags gains
  Reverse; ImPlotPieChartFlags gains Exploding + NoSliceBorder;
  new ImPlotBubblesFlags / ImPlotPolygonFlags enums are AST-driven.

Example: ExampleImPlot grows a "Per-Index Colors (v1.0 PR #672)" plot
showing rainbow LineColors + MarkerFillColors + ramping MarkerSizes.

Note: this is source-incompatible for any caller of the affected Plot*
methods or the removed SetNextX helpers. The incompatibility mirrors
upstream implot's own v1.0 break and is the minimum footprint to expose
the new ImPlotSpec-based API.

Dear ImGui submodule is intentionally left at v1.90.9-docking. implot
v1.0 guards its 1.92-era uses (ImTextureRef, ImFontBaked, CalcFontSize)
behind `#ifdef IMGUI_HAS_TEXTURES` / `IMGUI_VERSION_NUM` and compiles
cleanly against 1.90.9.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: phraktle

README.md

@@ -316,13 +316,13 @@ If using Java 9 modules, ImGui Java has Automatic Module Names:
 All extensions are already included in the binding and can be used as it is.
 See examples in the `example` module for more information about how to use them.
 
-- [ImNodes](https://github.com/Nelarius/imnodes/tree/b2ec254ce576ac3d42dfb7aef61deadbff8e7211) | [Example](https://github.com/SpaiR/imgui-java/blob/main/example/src/main/java/ExampleImNodes.java) <br>
+- [ImNodes](https://github.com/Nelarius/imnodes/tree/857cc860af05ac0f6a4039c2af33d982377b6cf4) | [Example](https://github.com/SpaiR/imgui-java/blob/main/example/src/main/java/ExampleImNodes.java) <br>
   A small, dependency-free node editor for Dear ImGui. (A good choice for simple start.)
-- [imgui-node-editor](https://github.com/thedmd/imgui-node-editor/tree/021aa0ea4da13fed864bafb2a92d4c5205076866) | [Example](https://github.com/SpaiR/imgui-java/blob/main/example/src/main/java/ExampleImGuiNodeEditor.java) <br>
+- [imgui-node-editor](https://github.com/thedmd/imgui-node-editor/tree/687a72f940c76cf5064e13fe55fa0408c18fcbe4) | [Example](https://github.com/SpaiR/imgui-java/blob/main/example/src/main/java/ExampleImGuiNodeEditor.java) <br>
   Node Editor using ImGui. (A bit more complex than ImNodes, but has more features.)
 - [ImGuizmo](https://github.com/CedricGuillemet/ImGuizmo/tree/f7bbbe39971d9d45816417a70e9b53a0f698c56e) | [Example](https://github.com/SpaiR/imgui-java/blob/main/example/src/main/java/ExampleImGuizmo.java) <br>
   Immediate mode 3D gizmo for scene editing and other controls based on Dear ImGui.
-- [implot](https://github.com/epezent/implot/tree/v0.17) | [Example](https://github.com/SpaiR/imgui-java/blob/main/example/src/main/java/ExampleImPlot.java) <br>
+- [implot](https://github.com/epezent/implot/tree/v1.0) | [Example](https://github.com/SpaiR/imgui-java/blob/main/example/src/main/java/ExampleImPlot.java) <br>
   Advanced 2D Plotting for Dear ImGui.  
 - [ImGuiColorTextEdit](https://github.com/BalazsJako/ImGuiColorTextEdit/tree/0a88824f7de8d0bd11d8419066caa7d3469395c4) | [Example](https://github.com/SpaiR/imgui-java/blob/main/example/src/main/java/ExampleImGuiColorTextEdit.java) <br>
   Syntax highlighting text editor for ImGui.