[example] Closes #4901, Fix Problems in 'text_draw_3d.c'

[ZeanKey]

Fixed multiple problems mentioned in #4901 , now the DrawText3D(), MeasureTextWave3D(), DrawTextWave3D() won't be affected by the base size of the font, which will show same effect as directly invoke DrawText() in 3D drawing.

This could be the expected effect of the 'text_draw_3d.c' as the creator of the example mentioned that they suppose MeasureTextEx() could work but didn't:

// Measure a text in 3D. For some reason `MeasureTextEx()` just doesn't seem to work so i had to use this instead.

As the unexpected scale is removed now MeasureTextEx() can normally function in program so I replaced MeasureText3D() with it.

Also, the "~~" markdown as command in wave text used to be counted for space and calculate character number in line in typer, which is now fixed by let counter only add up in characters not '\n' or '~' in "~~".

The line space and space now would not be scaled by scale factor as these arguments works in 2D text functions, and removed duplicated accumulation for space in MeausreTextWave3D().

[raysan5]

@ZeanKey Thanks for the review! I'm not fully convinced if this should be the expected behaviour but the truth is that it looks good and seems more aligned to raylib 2d text behaviour.