Migrate edicon to Ruby Implementation

[shinokaro]

This pull request introduces a Ruby-based implementation of the previously C-based edicon.exe. Opting for a Ruby reimplement over fixing the existing C code will shorten the build times and make maintenance easier, leveraging widely accessible Microsoft documentation.

Reference Information: The original edicon.c contained several issues that are being addressed by this reimplementation:

• BeginUpdateResource was incorrectly compared to INVALID_HANDLE_VALUE. Proper error checking requires comparison to NULL.(https://github.com/Largo/ocran/blob/201f51ad4f39eba953682d17e5ceb013c74e3939/src/edicon.c#L58)
• The calculation of GroupIconSize was incorrect. It should have been calculated using the size of IconDirResEntry multiplied by the number of images, instead of using IconDirectoryEntry.(https://github.com/Largo/ocran/blob/201f51ad4f39eba953682d17e5ceb013c74e3939/src/edicon.c#L97)

This reimplement ensures that the functionality of EdIcon is preserved while simplifying future enhancements and maintenance.