thcon 0.1.0

A configurable theme controller that switches multiple apps between light and dark mode
Documentation 
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# Konsole
Profile controllable via DBus's session bus!

Service: org.kde.konsole-${process id}
Method: /Sessions/:id/org.kde.konsole.Session/setProfile
Args: [profileName (QString)]

```
method call time=1602561138.387779 sender=:1.173 -> destination=org.kde.konsole-13511 serial=182 path=/Sessions/1; interface=org.kde.konsole.Session; member=setProfile
   string "zipper"
method return time=1602561138.418847 sender=:1.114 -> destination=:1.173 serial=827 reply_serial=182
```

in bash:
```bash
# list all konsole destinations
$ dbus-send --print-reply --session --dest=org.freedesktop.DBus --type=method_call /org/freedesktop/DBus org.freedesktop.DBus.ListNames | grep '^org.kde.konsole-'

# find active sessions
$ dbus-send --print-reply --session --dest=org.kde.konsole-13511 --type=method_call /Sessions org.freedesktop.DBus.Introspectable.Introspect

# switch profile in a session
$ dbus-send --session --dest=org.kde.konsole-13511 --type=method_call /Sessions/1 org.kde.konsole.Session.setProfile string:'Profile 1'
```

default profile stored in ~/.config/konsolerc

```toml
[Desktop Entry]
DefaultProfile=Profile 1.profile

[Favorite Profiles]
Favorites=

[KonsoleWindow]
ShowWindowTitleOnTitleBar=true

[MainWindow]
Height 1080=982
State=AAAA/wAAAAD9AAAAAAAAA8AAAAPRAAAABAAAAAQAAAAIAAAACPwAAAAA
ToolBarsMovable=Disabled
Width 1920=960
```

Unfortunately we can't link against KConfig (which is what Konsole and everything else in KDE Frameworks uses to manage those ${app}rc files), so we'll have to either:
* Parse that rc file like it's INI
* Parse that rc file like it's TOML
* Shell out to kwriteconfig5 <--- probably the best

# Gnome Terminal
* on-click handler for profile switching in context menu: https://gitlab.gnome.org/GNOME/gnome-terminal/-/blob/36dafa7b2eca439158863614cadb9e1e7df233a9/src/terminal-window.c#L1434-1452
* `g_simple_action_set_state` defined by gio project: https://developer.gnome.org/gio/stable/GSimpleAction.html#g-simple-action-set-state
* use gio crate? https://crates.io/crates/gio
    * gio::SimpleAction maps pretty nicely, but how do I get a window handle to call the equivalent of `lookup_action`?

args in d-feet at least: {"profile", GLib.Variant('s', "b1dcc9dd-5262-4d8d-a863-c897e6d979b9"), {}}

in bash:
```
list windows:
$ dbus-send --print-reply --session --dest=org.gnome.Terminal --type=method_call /org/gnome/Terminal/window org.freedesktop.DBus.Introspectable.Introspect

$ dbus-send --print-reply --session --dest=org.gnome.Terminal --type=method_call /org/gnome/Terminal/window/:id org.gtk.Actions.SetState {"profile", GLib.Variant('s', ":id"), {}}
```

# KDE Plasma
Doesn't look like there's any option beyond shelling out to `lookandfeeltool --apply` with a theme from `lookandfeeltool --list`, but that's fine

# VSCode
rewrite ~/.config/Code/User/settings.json

# Atom (via flatpak)
rewrite ~/.var/app/io.atom.Atom/data/config.cson

# GENERAL
Do I need to make the settings file configurable per-platform?  Probably.