Moved version number higher up in imgui.h to increase visibility

- This allow using version number in imconfig
- This technically makes the #ifdef IMGUI_VERSION check valid in case of using IMGUI_DISABLE
- This makes available IMGUI_VERSION/IMGUI_VERSION_NUM with IMGUI_DISABLE - bit of a harmless leak

imgui.h

@@ -20,6 +20,12 @@
 // - For first-time users having issues compiling/linking/running or issues loading fonts:
 //   please post in https://github.com/ocornut/imgui/discussions if you cannot find a solution in resources above.
 
+// Library Version
+// (Integer encoded as XYYZZ for use in #if preprocessor conditionals, e.g. '#if IMGUI_VERSION_NUM > 12345')
+#define IMGUI_VERSION               "1.89 WIP"
+#define IMGUI_VERSION_NUM           18819
+#define IMGUI_HAS_TABLE
+
 /*
 
 Index of this file:
@@ -62,13 +68,6 @@ Index of this file:
 #include <stddef.h>                 // ptrdiff_t, NULL
 #include <string.h>                 // memset, memmove, memcpy, strlen, strchr, strcpy, strcmp
 
-// Version
-// (Integer encoded as XYYZZ for use in #if preprocessor conditionals. Work in progress versions typically starts at XYY99 then bounce up to XYY00, XYY01 etc. when release tagging happens)
-#define IMGUI_VERSION               "1.89 WIP"
-#define IMGUI_VERSION_NUM           18819
-#define IMGUI_CHECKVERSION()        ImGui::DebugCheckVersionAndDataLayout(IMGUI_VERSION, sizeof(ImGuiIO), sizeof(ImGuiStyle), sizeof(ImVec2), sizeof(ImVec4), sizeof(ImDrawVert), sizeof(ImDrawIdx))
-#define IMGUI_HAS_TABLE
-
 // Define attributes of all API symbols declarations (e.g. for DLL under Windows)
 // IMGUI_API is used for core imgui functions, IMGUI_IMPL_API is used for the default backends files (imgui_impl_xxx.h)
 // Using dear imgui via a shared library is not recommended, because we don't guarantee backward nor forward ABI compatibility (also function call overhead, as dear imgui is a call-heavy API)
@@ -87,6 +86,7 @@ Index of this file:
 #define IM_ARRAYSIZE(_ARR)          ((int)(sizeof(_ARR) / sizeof(*(_ARR))))     // Size of a static C-style array. Don't use on pointers!
 #define IM_UNUSED(_VAR)             ((void)(_VAR))                              // Used to silence "unused variable warnings". Often useful as asserts may be stripped out from final builds.
 #define IM_OFFSETOF(_TYPE,_MEMBER)  offsetof(_TYPE, _MEMBER)                    // Offset of _MEMBER within _TYPE. Standardized as offsetof() in C++11
+#define IMGUI_CHECKVERSION()        ImGui::DebugCheckVersionAndDataLayout(IMGUI_VERSION, sizeof(ImGuiIO), sizeof(ImGuiStyle), sizeof(ImVec2), sizeof(ImVec4), sizeof(ImDrawVert), sizeof(ImDrawIdx))
 
 // Helper Macros - IM_FMTARGS, IM_FMTLIST: Apply printf-style warnings to our formatting functions.
 #if !defined(IMGUI_USE_STB_SPRINTF) && defined(__MINGW32__) && !defined(__clang__)