Callsigns (#37)

* Plugin callsigns, filechangehandler thread bug fix, plugin file perms

- Plugins are now assigned a callsign (a random string), which they use for all internal identification, like resource fetching and method calls. This is to ensure that plugins only access their own resources and methods.
- Made FileChangeHandler send off events to a queue, that is then consumed by the Loader, instead of calling import_plugin on its own, since that caused weird issues with the event loop and the thread watchdog is using.
- Plugins are now owned by root and have read-only permissions. This is handled automatically.

* Improved general look and feel of plugin tab

* Make all plugin entries have the same padding between them

* Make "No plugins installed" text look the same as "No new notifications"

Co-authored-by: WerWolv <werwolv98@gmail.com>

plugin_loader/browser.py

@@ -9,6 +9,7 @@ from concurrent.futures import ProcessPoolExecutor
 from asyncio import get_event_loop
 from time import time
 from hashlib import sha256
+from subprocess import Popen
 
 class PluginInstallContext:
     def __init__(self, gh_url, version, hash) -> None:
@@ -35,6 +36,8 @@ class PluginBrowser:
         zip_file = ZipFile(zip)
         zip_file.extractall(self.plugin_path)
         rename(path.join(self.plugin_path, zip_file.namelist()[0]), path.join(self.plugin_path, name))
+        Popen(["chown", "-R", "deck:deck", self.plugin_path])
+        Popen(["chmod", "-R", "555", self.plugin_path])
         return True
 
     async def _install(self, artifact, version, hash):