Change return type from void to int, for functions that set an error

(SDL_SetError(), SDL_OutOfMemory(), SDL_Unsupported(), SDL_InvalidParam())

Update prototype to forward errors to generic layer, for the functions:
MoveCursor, WarpMouse, GL_DeleteContext, GetDisplayModes.

Check invalid parameter in SDL_SetTextInputRect() generic layer.

include/SDL3/SDL_keyboard.h

@@ -310,12 +310,14 @@ extern DECLSPEC SDL_bool SDLCALL SDL_TextInputShown(void);
  *
  * \param rect the SDL_Rect structure representing the rectangle to receive
  *             text (ignored if NULL)
+ * \returns 0 on success or a negative error code on failure; call
+ *          SDL_GetError() for more information.
  *
  * \since This function is available since SDL 3.0.0.
  *
  * \sa SDL_StartTextInput
  */
-extern DECLSPEC void SDLCALL SDL_SetTextInputRect(const SDL_Rect *rect);
+extern DECLSPEC int SDLCALL SDL_SetTextInputRect(const SDL_Rect *rect);
 
 /**
  * Check whether the platform has screen keyboard support.