Externals / VideoCommon: update imgui to 1.91.7 and implot to v0.16; imgui changed types for ImTextureId, which was addressed by using an implicit cast

Source/Core/VideoCommon/AbstractTexture.cpp

@@ -5,12 +5,17 @@
 
 #include <algorithm>
 
+#include <imgui.h>
+
 #include "Common/Assert.h"
 #include "Common/Image.h"
 #include "Common/MsgHandler.h"
 #include "VideoCommon/AbstractGfx.h"
 #include "VideoCommon/AbstractStagingTexture.h"
 
+static_assert(std::is_same_v<AbstractTexture::imgui_texture_id, ImTextureID>,
+              "The typedef should match ImTextureID in imgui");
+
 AbstractTexture::AbstractTexture(const TextureConfig& c) : m_config(c)
 {
 }