Put the modules in a package and the scripts in a folder

Twenty-two files at the top of the tree was the first thing anybody saw of
this repository. They are one package now, imported relatively, and the three
scripts that are not the front door moved under scripts/. install.sh stays
where the README has always said it is.

What starts the application is dikte/__main__.py: python3 -m dikte runs it,
and so does naming the file, which is what the launcher symlink, both .desktop
files, the macOS bundle and every registered shortcut do. Run by path there is
no package around it, so it puts the checkout on sys.path itself.

The installers now keep the keys you chose when they are given none, which is
what an update is: update.sh no longer has to read them out and pass them back.
An updater from before this commit cannot read them at all, so the one thing it
can say, the default key with an empty discard key, is read as "nothing was
asked for" rather than obeyed. That guard can go once nobody is updating across
this commit.

README.md

@@ -56,7 +56,7 @@ tools instead:
 sudo apt install pulseaudio-utils xclip xdotool ffmpeg
 ```
 
-On macOS the same `./install.sh` runs and hands over to `install-mac.sh`, which
+On macOS the same `./install.sh` runs and hands over to `scripts/install-mac.sh`, which
 puts down a `Dikte.app` in `~/Applications`, the `dikte` command and a
 LaunchAgent:
 
@@ -84,9 +84,10 @@ transcribe in the cloud. A meeting needs BlackHole or Loopback
 (`brew install blackhole-2ch`); dictation does not.
 
 `install.sh` adds the `dikte` command, a menu entry, an autostart entry and the
-two global shortcuts, whose keys are its two arguments. `./update.sh` pulls and
-puts all of that back, keeping the keys you chose; `./uninstall.sh` takes it away
-again and leaves your settings and dictations alone unless you pass `--purge`.
+two global shortcuts, whose keys are its two arguments, or the ones already in
+your settings when it is given none. `./scripts/update.sh` pulls and puts all of
+that back; `./scripts/uninstall.sh` takes it away again and leaves your settings
+and dictations alone unless you pass `--purge`.
 
 Speech to text and cleanup each pick a provider in the settings window, and both
 run here by default, on models of your own. The cloud is the other option:
@@ -201,8 +202,13 @@ keys.
 
 ## Layout
 
+Everything below is in the `dikte` package, which is what `python3 -m dikte`
+runs and what the `__main__.py` in it hands to every launcher and shortcut.
+`scripts/` holds install-mac.sh, update.sh and uninstall.sh; install.sh stays at
+the top, and `tests/` has a file per module.
+
 ```
-dikte.py          entry point, tray icon, state machine
+app.py            entry point, tray icon, state machine
 cli.py            the command line: every verb, and what it answers with
 ipc.py            one request and one reply over the local socket
 audio.py          PCM capture: pw-record for dictation, ffmpeg for a meeting
@@ -224,7 +230,7 @@ i18n.py           the string table
 ```
 
 The indicator is drawn through XWayland, because a Wayland client cannot place a
-window in a screen corner; `dikte.py` sets `QT_QPA_PLATFORM=xcb` for that.
+window in a screen corner; `app.py` sets `QT_QPA_PLATFORM=xcb` for that.
 
 ## License