Plugin installation path

[maraf]

Feature description

In PluginManager scenario, when GE is in the write-protected directory, UAC must be confirmed everytime PM tries to do changes.

In maraf/GitExtensions.PluginManager#59 and #5775 we have briefly discussed that all plugins could be placed somewhere else, eg CommonApplicationData.

I would like to discuss the solution and then would be happy to do a PR.

[RussKie]

User's settings are stored in C:\Users\<user>\AppData\Roaming\GitExtensions\GitExtensions, would this be a good place to store plugins too?

[mast-eu]

Quick check on software with downloadable plugins found on my PC:

• Visual Studio uses C:\Users\<user>\AppData\Local\Microsoft\VisualStudio\15.0_b13c254b\Extensions
• Visual Studio Code uses C:\Users\<user>\.vscode\extensions
• GIMP uses C:\Users\<user>\AppData\Roaming\GIMP\2.10\plug-ins

And a few more I looked up on the internet:

• Firefox uses C:\Users\<user>\AppData\Local\Mozilla\plugins
• Chrome uses C:\Users\<user>\AppData\Local\Google\Chrome\User Data\Default\Extensions
• Notepad++ uses C:\Users\<user>\AppData\Roaming\Notepad++\plugins

There seems to be a common agreement to use C:\Users\<user>\AppData\<Local|Roaming>, with VS Code being the only notable exception I found. But even VS Code uses C:\Users\<user>, so different users on the same machine are isolated against each other.

What's the difference between C:\Users\<user>\AppData\Local and C:\Users\<user>\AppData\Roaming? MSDN explains that Roaming User Profiles are automatically synced when the user logs on any PC on the same (company) network. On the other hand, Local User Profiles remain on a single PC.
IMHO it's better to not sync plugins between PCs. Maybe they have different GE versions, .NET versions or other troublemakers.

Conclusion: Something like C:\Users\<user>\AppData\Roaming\GitExtensions\GitExtensions\plugins\<plugin_name> should be fine for plugin-specific data, if needed. But I prefer C:\Users\<user>\AppData\Local\GitExtensions\GitExtensions\plugins\<plugin_name> for the binaries.

[RussKie]

Thank you.
The only reason I'd go to Roaming to have all our files in one place. But it is not a deal breaker for me (at least at this stage).

[maraf]

As part of this change:

1. Should all plugins (even those pre-installed) be moved there?
2. Should the pre-installed plugins be packed as nugets?
3. Should there be a way to clean up this folder (in case of things go wrong)?

The PM is pre-installed and has a self update feature, so it should be in the AppData folder.

[RussKie]

1. Should all plugins (even those pre-installed) be moved there?
2. Should the pre-installed plugins be packed as nugets?

Yes, when we actually get to separating plugins out of the main repo

3. Should there be a way to clean up this folder (in case of things go wrong)?

Possibly

[mast-eu]

Manually closing issue, after #6551 has been merged.
(I just learned that Solves #6415 does not close issues automatically when merging a PR)

[vbjay]

https://help.github.com/en/articles/closing-issues-using-keywords

That's why our templates say

fixes #