This change allows more versatile and consistent splines drawing. It also gives more control to advance users to draw splines as individual segments.

RENAMED: `DrawLine<spline_type>()` to `DrawSpline<spline_type>()` for more consistent and clear naming
REVIEWED: Bezier drawing parameters order, more consistent
REVIEWED: Spline-based examples -WIP-

* allow zig 0.11.0 and 0.12.0dev to build raylib

* update comment

For some reason, the equivalent requested context (WebGL 2.0) is not provided, despite being properly requested.

* Fix gestures for SDL

* Review the gesture handling for SDL

* Review 2