Crash with slider_int2 (and other similar functions)

[J-Revel]

slider_float2 takes a [2]f32 as input, and crashes whenever the user tries to use the widget. It works by replacing it with a ^[2]f32.
Same problem with slider_float3, slider_int2, etc.

[colinbellino]

@ThisDevDane Would you accept a pull request to fix that? I also had to fix it locally also but i can take some time to prepare a PR.