* Switch modules to `esnext` to allow `webpack` to see import statements
* Pass rom names into Apple2 class
* Move ROMs into `system` and `character` directories to allow webpack bundle appropriate ROMs.
* Wait for ROMs to load before completing initialization.
This change adds basic, non-optimal support for Typescript with
webpack. It functions well in development mode and deployment boots
ProDOS. There are probably many ways this configuration can be sped
up, but I haven't investigated that yet.
Note that no Typescript files are added in this change; it is merely a
configuration change.
