Encode version string in binary to facilitate identification when dem…

…o/tools are striped + amend About window.

imgui.cpp

@@ -3512,6 +3512,7 @@ void ImGui::DestroyContext(ImGuiContext* ctx)
 // IMPORTANT: ###xxx suffixes must be same in ALL languages
 static const ImGuiLocEntry GLocalizationEntriesEnUS[] =
 {
+    { ImGuiLocKey_VersionStr,           "Dear ImGui " IMGUI_VERSION " (" IM_STRINGIFY(IMGUI_VERSION_NUM) ")" },
     { ImGuiLocKey_TableSizeOne,         "Size column to fit###SizeOne"          },
     { ImGuiLocKey_TableSizeAllFit,      "Size all columns to fit###SizeAll"     },
     { ImGuiLocKey_TableSizeAllDefault,  "Size all columns to default###SizeAll" },

imgui_demo.cpp

@@ -5940,10 +5940,11 @@ void ImGui::ShowAboutWindow(bool* p_open)
         return;
     }
     IMGUI_DEMO_MARKER("Tools/About Dear ImGui");
-    ImGui::Text("Dear ImGui %s", ImGui::GetVersion());
+    ImGui::Text("Dear ImGui %s (%d)", IMGUI_VERSION, IMGUI_VERSION_NUM);
     ImGui::Separator();
     ImGui::Text("By Omar Cornut and all Dear ImGui contributors.");
     ImGui::Text("Dear ImGui is licensed under the MIT License, see LICENSE for more information.");
+    ImGui::Text("If your company uses this, please consider sponsoring the project!");
 
     static bool show_config_info = false;
     ImGui::Checkbox("Config/Build Information", &show_config_info);

imgui_internal.h

@@ -268,6 +268,8 @@ namespace ImStb
 #define IM_F32_TO_INT8_SAT(_VAL)        ((int)(ImSaturate(_VAL) * 255.0f + 0.5f))               // Saturated, always output 0..255
 #define IM_FLOOR(_VAL)                  ((float)(int)(_VAL))                                    // ImFloor() is not inlined in MSVC debug builds
 #define IM_ROUND(_VAL)                  ((float)(int)((_VAL) + 0.5f))                           //
+#define IM_STRINGIFY_HELPER(_X)         #_X
+#define IM_STRINGIFY(_X)                IM_STRINGIFY_HELPER(_X)                                 // Preprocessor idiom to stringify e.g. an integer.
 
 // Enforce cdecl calling convention for functions called by the standard library, in case compilation settings changed the default to e.g. __vectorcall
 #ifdef _MSC_VER
@@ -1654,6 +1656,7 @@ struct ImGuiSettingsHandler
 // This is experimental and not officially supported, it'll probably fall short of features, if/when it does we may backtrack.
 enum ImGuiLocKey : int
 {
+    ImGuiLocKey_VersionStr,
     ImGuiLocKey_TableSizeOne,
     ImGuiLocKey_TableSizeAllFit,
     ImGuiLocKey_TableSizeAllDefault,