Added Compatibility with latest imgui version

[Tiamat-Defender]

I was having a issue with imrad.h and fixed the issue by changing the NavDisableHighlight to NavHighlightItemUnderNav and also changed strncpy to strncpy_s so i figured you might like this or just think about implement NavHighlightItemUnderNav into the codebase.

[tpecholt]

Thanks for your work. However there are issues with your pull request:

1. strncpy_s is only available in msvc. So you would have to #ifdef it. But because it's not portable and also not considered safer by some silencing the error on your side (_CRT_SECURE_NO_WARNINGS ) is usually a better idea. It should not be put to imrad.h to let the user decide how to handle it.
2. you seem to base your PR on older version of imrad.h which doesn't contain the IMRAD_INPUTTEXT_EVENT macro and that gives more errors.
3. NavDisableHighlight was already fixed earlier.

Because of these points I don't think merging your pull request is beneficial. Does _CRT_SECURE_NO_WARNINGS fix your compilation issue?

[Tiamat-Defender]

Yes i completely agree to this lol i dont know why it gave me a outdated version of imrad.h im stupid sometimes have a nice day sorry for any inconveniences i may have caused.