Updates the plugin manager window to use the new failed module info.
Plugins installed in legacy folder locations are marked as Legacy with
a notice that will stop working in the future.
Plugins that failed to load are listed under an Errors section.
Plugins in the modules.json file that are not found are listed under
a Missing section. These entries can be removed from the modules.json
via a delete button.
This also cleans up some other small issues and updates the dialog
buttons to be Save/Discard instead of Ok/Close.
For phase 1 of the plugin manager, the ability to toggle off/on plugins
to be loaded at launch is provided.
This commit adds a new Plugin Manager dialog which can be accessed from
the Tools menu, which shows a list of all installed 3rd party plugins
with a checkbox to toggle them off or on. If a change is made, the user
is prompted to restart OBS. To allow this, the plugin manager uses a
json based config file stored in the OBS config directory. Additionally
for sources in the source tree, a sample UI has been provided that
indicates any sources whose parent module is disabled, by turning its
title red.