Adding support for drawing CJK characters with ImTui

[katemonster33]

Summary

Features "Adding support for ImTui to draw unicode characters"

Purpose of change

Fixes: #73205
ImTui out of the box does not support drawing unicode characters. We are adding that here.

Describe the solution

Use a variation of the method employed by #72579 to interrupt the normal drawing flow of imgui to tell ImTui to render the intended characters.

Describe alternatives you've considered

Same as with #72579 , we could simply add all unicode characters to the ImGui cache, which would balloon the memory usage by several gigabytes. this is gross though and we're not doing that

Testing

build curses build, set language to Chinese, Japanese or Korean, load keybindings UI from the main menu and verify the characters draw properly.

Additional context

[I-am-Erk]

i went in and tried to review your code and then I remembered that no, i don't. so far you haven't destroyed the game though.

[katemonster33]

@I-am-Erk thank you for the vote of confidence but I believe this branch had a clang tidy error >.>

[I-am-Erk]

Number of times you have destroy game += 1