Update build instructions

COMPILING.MD

@@ -1,40 +1,51 @@
-# Building Image Uploader GUI (or CLI) on Windows
+# Building Image Uploader on Windows
 
-Before building Image Uploader, install Python 3 interpreter for performing pre-build and post-build events. Ensure that your %PATH% environment 
-variable includes the directory of your Python distribution.
 
 To build Image Uploader from source files you will need:
 - Git 		https://git-scm.com/downloads
 - Microsoft Visual Studio 2019 or newer (with C++ compiler)   https://visualstudio.microsoft.com/downloads/
 - CMake (tested with v3.24.0)    https://cmake.org/
 - Python 3    https://www.python.org/downloads/
-- Conan (C++ package manager)   https://conan.io/
+- Conan v1.x (C++ package manager)   https://conan.io/
 
-I recommend to install Conan using `pip` utility.
+I recommend to install Conan using `pip` utility. Ensure that your %PATH% environment 
+variable includes the directory of your Python and CMake distribution. 
 
-To generate a Visual Studio solution from CMakeLists.txt you need to create a directory for 
-temporary files and call cmake:
+To generate a Visual Studio solution from CMakeLists.txt you need to create a directory for build files and call `cmake`:
 
 ```
 mkdir Build
 cd Build
 ```
 
+The recommended way is to pass conan profile to the `cmake` command.
+
 ```
-cmake <path_to_imageuploader_source>\Source -G "Visual Studio 17 2022" -A Win32 -DCMAKE_BUILD_TYPE=Release -DCMAKE_CONFIGURATION_TYPES:STRING=Release -DCMAKE_TRY_COMPILE_CONFIGURATION:STRING=Release
+cmake <path_to_imageuploader_source>\Source -G "Visual Studio 17 2022" -A Win32 -DIU_HOST_PROFILE=default -DIU_BUILD_PROFILE=default 
 ```
-
-Another way is to pass conan profile name to cmake:
+The old way:
 
 ```
-cmake <path_to_imageuploader_source>\Source -G "Visual Studio 17 2022" -DIU_HOST_PROFILE=default
+cmake <path_to_imageuploader_source>\Source -G "Visual Studio 17 2022" -A Win32 -DCMAKE_BUILD_TYPE=Release -DCMAKE_CONFIGURATION_TYPES:STRING=Release -DCMAKE_TRY_COMPILE_CONFIGURATION:STRING=Release
 ```
 
-Then open solution in Visual Studio **or** run command:
+If you are cross-compiling (from Windows x64 to x86) and want to build FFmpeg libraries from Conan repository then you should use two profiles (`-DIU_HOST_PROFILE=windows_vs2019_x86_release -DIU_BUILD_PROFILE=windows_vs2019_x64_release`)
+
+After that, you can open the generated project in Visual Studio and build it there. Also you can run the command:
 ```
 cmake --build . --config Release
 ```
 
+The same you can achieve using `cmake-gui` utility.
+In cmake-gui you can see all compilation options and easily change them.
+
+If you want to build Image Uploader with separate FFmpeg libraries (`IU_ENABLE_FFMPEG=On` and `IU_FFMPEG_STANDALONE=On`), after building put them (avcodec.lib, avformat.lib, avutil.lib, swscale.lib) into `Contrib\Lib` directory and header files into `Contrib\Include` directory.
+
+If you want to build IU with Microsoft Edge Webview2 support (`IU_ENABLE_WEBVIEW2=On`), you should install package "Microsoft.Web.WebView2" using NuGet package manager (https://docs.microsoft.com/en-us/microsoft-edge/webview2/get-started/win32),
+then copy header files `(*.h)` to the "Contrib\Include" directory, and copy `*.lib` files to Contrib\Lib directory.
+
+Some examples, nevermind:
+
 ```
 cmake ..\Source -G "Visual Studio 16 2019" -A Win32 -DCMAKE_BUILD_TYPE=Debug -DIU_HOST_PROFILE=vs2019_x86_debug -DIU_BUILD_PROFILE=vs2022_x64 -DIU_ENABLE_FFMPEG=On -DIU_ENABLE_WEBVIEW2=On 
 
@@ -45,13 +56,6 @@ For ARM64:
 ```
 cmake ..\Source -G "Visual Studio 16 2019" -A ARM64 -DCMAKE_BUILD_TYPE=Release -DIU_HOST_PROFILE=../Conan/profiles/vs2019_arm64_release -DIU_BUILD_PROFILE=../Conan/Profiles/vs2022_x64 -DIU_ENABLE_FFMPEG=On -DIU_ENABLE_WEBVIEW2=On -DIU_FFMPEG_STANDALONE=On -DIU_ENABLE_MEDIAINFO=Off
 ```
-The more convenient way to achieve the same is to use `cmake-gui`.
-In cmake-gui you can see all compiling options and change them easily.
-
-If you want to build Image Uploader with FFmpeg libraries (`IU_ENABLE_FFMPEG=On`), you have to built them separately and put them (avcodec.lib, avformat.lib, avutil.lib, swscale.lib) into `Contrib\Lib` directory.
-
-If you need Microsoft Edge Webview2 (`IU_ENABLE_WEBVIEW2=On`), you should install it using NuGet package manager (https://docs.microsoft.com/en-us/microsoft-edge/webview2/get-started/win32),
-then copy header files `(*.h)` to the "Contrib\Include" directory, and copy `*.lib` files to Contrib\Lib directory.
 
 # Building on Ubuntu (CLI and Qt GUI)
 
@@ -129,6 +133,8 @@ base64          https://github.com/aklomp/base64
 
 UTF8-CPP        http://utfcpp.sourceforge.net/ 
 
+libheif         https://github.com/strukturag/libheif 
+
 DirectShow BaseClasses (strmbasd.lib, strmbase.lib) - part of Windows SDK
 
 Libraries for building Mega.nz: