feat(api): add missing ImGui.TableGetSortSpecs API (and related objects) (#246)

* Add missing GetTableSortSpecs API

* Add binding for TreeNodeEx(const char* label, ImGuiTreeNodeFlags flags)

* Add generated files

* Wrap > character in code block

Co-authored-by: SpaiR <klimbetoo@gmail.com>

* Wrap > character in code block

Co-authored-by: SpaiR <klimbetoo@gmail.com>

---------

Co-authored-by: SpaiR <klimbetoo@gmail.com>

imgui-binding/src/main/java/imgui/ImGuiTableSortSpecs.java

@@ -0,0 +1,66 @@
+package imgui;
+
+import imgui.binding.ImGuiStruct;
+import imgui.binding.annotation.BindingField;
+import imgui.binding.annotation.BindingField.Accessor;
+import imgui.binding.annotation.BindingSource;
+
+/**
+ * Sorting specifications for a table (often handling sort specs for a single column, occasionally more)
+ * Obtained by calling TableGetSortSpecs().
+ * When 'SpecsDirty == true' you can sort your data. It will be true with sorting specs have changed since last call, or the first time.
+ * Make sure to set 'SpecsDirty = false' after sorting, else you may wastefully sort your data every frame!
+ */
+@BindingSource
+public final class ImGuiTableSortSpecs extends ImGuiStruct {
+
+    public ImGuiTableSortSpecs(final long ptr) {
+        super(ptr);
+    }
+
+    /*JNI
+        #include "_common.h"
+        #define THIS ((ImGuiTableSortSpecs*)STRUCT_PTR)
+     */
+
+    /**
+     * Pointer to sort spec array.
+     */
+    public ImGuiTableColumnSortSpecs[] getSpecs() {
+        long[] specsPointers = nGetSpecs();
+        ImGuiTableColumnSortSpecs[] specs = new ImGuiTableColumnSortSpecs[specsPointers.length];
+        for (int i = 0; i < specsPointers.length; i++) {
+            specs[i] = new ImGuiTableColumnSortSpecs(specsPointers[i]);
+        }
+        return specs;
+    }
+
+    private native long[] nGetSpecs(); /*
+        const ImGuiTableColumnSortSpecs* specs = THIS->Specs;
+        int specsCount = THIS->SpecsCount;
+        jlong jBuf[specsCount];
+        for (int i = 0; i < specsCount; i++) {
+            jBuf[i] = (intptr_t)specs;
+            specs++;
+        }
+        jlongArray result = env->NewLongArray(specsCount);
+        env->SetLongArrayRegion(result, 0, specsCount, jBuf);
+        return result;
+    */
+
+    /**
+     * Sort spec count. Most often 1. May be {@code > } 1 when ImGuiTableFlags_SortMulti is enabled. May be == 0 when ImGuiTableFlags_SortTristate is enabled.
+     */
+    @BindingField(accessors = { Accessor.GETTER })
+    public int SpecsCount;
+
+    /**
+     * Set to true when specs have changed since last time! Use this to sort again, then clear the flag.
+     */
+    @BindingField
+    public boolean SpecsDirty;
+
+    /*JNI
+        #undef THIS
+     */
+}