Added pre-update checks

Added checks which are run before an updated plugin is copied:

• Does the server have the plugin installed? (Improved)
• Is the plugin file valid?
• Is the plugin file a newer version than the one installed?

Some small fixes and logging improvements.

Always test with --simulate first.

Fixed info command

Fixed cases where info command could not extract plugin information.
Added --debug flag to show debug log messages.

Added Info Command

Introducing commands:
pupdate update and pupdate info.

The info command can extract information about a plugin (file) such as version, author etc.
The update command is the old default mode to update plugins.

Tool released

This the first version. I've fixed the majority of bugs, but it's far from perfect.
Make sure to use the flag --simulate to preview changes. Always create backups before trying out new software on production systems!

The binary is bundled for linux. If you need any other platform clone the repository and use pkg to build (see package.json). Alternatively just clone, npm install and npm start -- [args] While in theory it should be compatible, I haven't tested with other platforms yet.