Fixed integer overflow with glyph ranges over the signed 16-bit integer limit.

[Igrium]

Fixed a regression where icon fonts with glyph ranges over the signed 16-bit integer limit may not render correctly due to an integer overflow (ImChar is supposed to be unsigned)

• Minor changes or tweaks (quality of life stuff)
• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

Note: needs more testing; I'm not too familiar with the testing process.

[Igrium]

nvm it didn't work. Still trying to figure out why some icons are broken after the update to 1.92

[Igrium]

So it turns out this wasn't the cause of my issue, but it wasn't "correct" anyway. I'll leave it up to you what you wanna do with it.