Going forward for new installations, config and data files will be
stored at the platform default paths, as defined by
[env-paths](https://www.npmjs.com/package/env-paths).
For backwards compatibility, if the `~/.waveterm` or `WAVETERM_HOME`
directory exists and contains valid data, it will be used. If this check
fails, then `WAVETERM_DATA_HOME` and `WAVETERM_CONFIG_HOME` will be
used. If these are not defined, then `XDG_DATA_HOME` and
`XDG_CONFIG_HOME` will be used. Finally, if none of these are defined,
the [env-paths](https://www.npmjs.com/package/env-paths) defaults will
be used.
As with the existing app, dev instances will write to `waveterm-dev`
directories, while all others will write to `waveterm`.
This adds support for windows builds. With it, the app can successfully
run on windows and unix systems. Note that the terminal still only works
on unix systems at this time.
I am updating the layout node setup to write to its own wave object.
The existing setup requires me to plumb the layout updates through every
time the tab gets updated, which produces a lot of annoying and
unintuitive design patterns. With this new setup, the tab object doesn't
get written to when the layout changes, only the layout object will get
written to. This prevents collisions when both the tab object and the
layout node object are getting updated, such as when a new block is
added or deleted.
