Redone the instance action toolbar:
* Removed all the dead actions
* Change icon and Rename are now morphed into a header
* Added button for opening the config folder
Implemented support for loose files and folders as legacy jar mods
Added texture pack support
* Errors are reported back to task users via Failure signals.
* Lwjgl doesn't download on each legacy instance start anymore.
* Tasks were unified when it comes to success/failure.
* Task dialogs don't get spawned after short tasks finish anymore.
The LWJGL list actually doesn't use tasks for loading. Instead, it takes advantage of the
QNetworkAccessManager's asynchronous requests. This is a system that I may look to implement for other version
lists and things such as the Minecraft version list and possibly even instance mod lists.
Loading things this way means that code that wants to load a list can simply call the load list function, rather
than having to get a task from the list and execute the task. Unfortunately, it also means we can't have task
progress dialogs for loading lists, but it shouldn't really be too difficult to write one that works with this
system.
At some point in the future, I'll probably end up putting all the code for this method of loading lists into a
base class and then update the other lists to support it.
Further work on this is still needed. Currently there is no sorting or filtering of any kind. In addition,
changes need to be made to fix issues with bad ETags since the current system here is based on MultiMC 4's
version list system before it was fixed.
