Some cleanup in video.rs; mostly returning SdlResult instead of bool
Some cleanup in video.rs; mostly returning SdlResult instead of bool

Convert functions that return a `bool` into returning `SdlResult<()>`.

WindowProperties::get_title() returns a string slice instead of a newly
allocated String.

Fix `Window::get_display_mode()`

bvssvni/rust-sdl2,inrustwetrust/rust-sdl2,oldmanmike/rust-sdl2,vadixidav/rust-sdl2,crumblingstatue/rust-sdl2,caldwell/rust-sdl2,Cobrand/rust-sdl2,tempbottle/rust-sdl2,Rust-SDL2/rust-sdl2,Rust-SDL2/rust-sdl2,Rust-SDL2/rust-sdl2,Cobrand/rust-sdl2,Cobrand/rust-sdl2,AngryLawyer/rust-sdl2,wilsoniya/rust-sdl2,bfops/rust-sdl2,nukep/rust-sdl2,beni55/rust-sdl2