Feat(raylib renderer): Make utf8 work with raylib renderer

[Forelyl]

Main problem was that firstly utf8 in raylib is been drawn in char* format
e.g cyrillic н is been represented as [208, 189] (Wiki - check 'Description' part)

So in short terms

1. 208 (first number of h) - would overflow and be saved as -48

int index = text.chars[i] - 32
int index = -48 - 32
int index = -80

3. Then it would cause out of bounds access
   fontToUse.glyphs[index]

The second issue was that

int index = text.chars[i] - 32
Reads only one char, while to decode utf-8 we need to read several of them

Third

Also added check on index to prevent out of bounds (if not all glyphs are loaded)

if (index < 0 || index >= fontToUse.glyphCount) {
    continue;                                       // skip characters not in the font
}