Fix strict TypeScript errors #106
                
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app.componentonly allowsstringas a first parameter: https://github.com/vuejs/core/blob/422ef34e487f801e1162bed80c0e88e868576e1d/packages/runtime-core/src/apiCreateApp.ts#L44But
Splide.nameandSplideSlide.nameare typed asstring | undefined: https://github.com/vuejs/core/blob/422ef34e487f801e1162bed80c0e88e868576e1d/packages/runtime-core/src/componentOptions.ts#L131So to pass
strictTypeScript type-checking, a non-null assertion operator can manually declare that the names are indeed non-nullable (see e.g.a3657c7/src/js/components/Splide/Splide.vue#L26).