Even though this isn't super critical, this might help with addressing https://stackoverflow.com/questions/57938081/blazor-preview-9-mono-wasm-memory-access-out-of-bounds-max-string-size-for-dotn

Currently we have a lot of public component props and methods but many of them should be private. We should revisit all components and make the necessary changes.

Here is an example from ErrorList component:
https://github.com/BlazorRepl/BlazorRepl/blob/5c7f061eb9cc75ac1121d70ba9f4828e9eb465c1/Client/Components/ErrorList.razor.cs#L22-L32

All of these properties and methods can be `privat