feat: add more internal widgets & flags (#301)

imgui-binding/src/main/java/imgui/internal/flag/ImGuiButtonFlags.java

@@ -0,0 +1,16 @@
+package imgui.internal.flag;
+
+import imgui.binding.annotation.BindingAstEnum;
+import imgui.binding.annotation.BindingSource;
+
+@BindingSource
+public final class ImGuiButtonFlags {
+    private ImGuiButtonFlags() {
+    }
+
+    @BindingAstEnum(file = "ast-imgui.json", qualType = "ImGuiButtonFlags_")
+    public Void __;
+
+    @BindingAstEnum(file = "ast-imgui_internal.json", qualType = "ImGuiButtonFlagsPrivate_", sanitizeName = "ImGuiButtonFlags_")
+    public Void ___;
+}

imgui-binding/src/main/java/imgui/internal/flag/ImGuiSeparatorFlags.java

@@ -0,0 +1,11 @@
+package imgui.internal.flag;
+
+import imgui.binding.annotation.BindingAstEnum;
+import imgui.binding.annotation.BindingSource;
+
+@BindingSource
+public class ImGuiSeparatorFlags {
+
+    @BindingAstEnum(file = "ast-imgui_internal.json", qualType = "ImGuiSeparatorFlags_")
+    public Void __;
+}

imgui-binding/src/main/java/imgui/internal/flag/ImGuiTextFlags.java

@@ -0,0 +1,11 @@
+package imgui.internal.flag;
+
+import imgui.binding.annotation.BindingAstEnum;
+import imgui.binding.annotation.BindingSource;
+
+@BindingSource
+public class ImGuiTextFlags {
+
+    @BindingAstEnum(file = "ast-imgui_internal.json", qualType = "ImGuiTextFlags_")
+    public Void __;
+}