Revert moving ImGuiKeyModFlags to internal.h (amendc906c65)

# Conflicts:
#	imgui.cpp

docs/CHANGELOG.txt

@@ -146,8 +146,6 @@ Breaking Changes:
     io.AddKeyEvent(), io.AddKeyAnalogEvent().
   - Added io.AddKeyAnalogEvent() function, obsoleting writing directly to io.NavInputs[] arrays.
 - Renamed ImGuiKey_KeyPadEnter to ImGuiKey_KeypadEnter to align with new symbols. Kept redirection enum. (#2625)
-- Moved ImGuiKeyModsFlags definition from imgui.h to imgui_internal.h. Was never advertised and used in a place
-  marked "private" in comments. Will still be used internally.
 - Removed support for legacy arithmetic operators (+,+-,*,/) when inputing text into a slider/drag. (#4917, #3184)
   This doesn't break any api/code but a feature that was accessible by end-users (which seemingly no one used).
   (Instead you may implement custom expression evaluators to provide a better version of this).

imgui.cpp

@@ -392,7 +392,6 @@ CODE
                         - likewise io.MousePos and GetMousePos() will use OS coordinates.
                           If you query mouse positions to interact with non-imgui coordinates you will need to offset them, e.g. subtract GetWindowViewport()->Pos.
 
- - 2022/01/26 (1.87) - inputs: moved ImGuiKeyModsFlags definition from imgui.h to imgui_internal.h. Was never advertised and used in a place marked "private" in comments. Will still be used internally.
  - 2022/01/20 (1.87) - inputs: reworded gamepad IO.
                         - Backend writing to io.NavInputs[]            -> backend should call io.AddKeyEvent()/io.AddKeyAnalogEvent() with ImGuiKey_GamepadXXX values.
  - 2022/01/19 (1.87) - sliders, drags: removed support for legacy arithmetic operators (+,+-,*,/) when inputing text. This doesn't break any api/code but a feature that used to be accessible by end-users (which seemingly no one used).

imgui.h

@@ -65,7 +65,7 @@ Index of this file:
 // 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               "1.87 WIP"
-#define IMGUI_VERSION_NUM           18614
+#define IMGUI_VERSION_NUM           18615
 #define IMGUI_CHECKVERSION()        ImGui::DebugCheckVersionAndDataLayout(IMGUI_VERSION, sizeof(ImGuiIO), sizeof(ImGuiStyle), sizeof(ImVec2), sizeof(ImVec4), sizeof(ImDrawVert), sizeof(ImDrawIdx))
 #define IMGUI_HAS_TABLE
 #define IMGUI_HAS_VIEWPORT          // Viewport WIP branch
@@ -1516,6 +1516,16 @@ enum ImGuiKey_
 #endif
 };
 
+// Helper "flags" version of key-mods to store and compare multiple key-mods easily. Sometimes used for storage (e.g. io.KeyMods) but otherwise not much used in public API.
+enum ImGuiKeyModFlags_
+{
+    ImGuiKeyModFlags_None           = 0,
+    ImGuiKeyModFlags_Ctrl           = 1 << 0,
+    ImGuiKeyModFlags_Shift          = 1 << 1,
+    ImGuiKeyModFlags_Alt            = 1 << 2,
+    ImGuiKeyModFlags_Super          = 1 << 3    // Cmd/Super/Windows key
+};
+
 // Gamepad/Keyboard navigation
 // Keyboard: Set io.ConfigFlags |= ImGuiConfigFlags_NavEnableKeyboard to enable. NewFrame() will automatically fill io.NavInputs[] based on your io.AddKeyEvent() calls.
 // Gamepad:  Set io.ConfigFlags |= ImGuiConfigFlags_NavEnableGamepad to enable. Backend: set ImGuiBackendFlags_HasGamepad and fill the io.NavInputs[] fields before calling NewFrame(). Note that io.NavInputs[] is cleared by EndFrame().

imgui_internal.h

@@ -1184,16 +1184,6 @@ enum ImGuiKeyPrivate_
     ImGuiKey_Gamepad_END            = ImGuiKey_GamepadRStickRight + 1
 };
 
-// Helper to store all mods easily. Stored in e.g. io.KeyMods.
-enum ImGuiKeyModFlags_
-{
-    ImGuiKeyModFlags_None           = 0,
-    ImGuiKeyModFlags_Ctrl           = 1 << 0,
-    ImGuiKeyModFlags_Shift          = 1 << 1,
-    ImGuiKeyModFlags_Alt            = 1 << 2,
-    ImGuiKeyModFlags_Super          = 1 << 3    // Cmd/Super/Windows key
-};
-
 enum ImGuiInputEventType
 {
     ImGuiInputEventType_None = 0,