Add path retention to the plugin manager.

[AlexIIL]

This allows plugins to scan from mods that were originally scanned before the plugin was loaded.

The main API addition is QuiltLoaderPlugin.isHigherPriorityThan, which is intended to allow plugin developers to co-operate on whether their plugin should take priority over mods loaded by another plugin, from the same original file.

This also adds a new table:

5 unknown / unsupported mod files found:
| Size (Bytes) | Type                | Path                                         |
|-------------:|---------------------|----------------------------------------------|
|       58,696 | risugamis_modloader | <mods>/buildcraft-1.4.1.zip                  |
|    3,477,068 | forge               | <mods>/buildcraft-7.2.8.jar                  |
|    7,137,846 | forge               | <mods>/journeymap-1.20.1-5.9.18-forge.jar    |
|    7,070,082 | neoforge            | <mods>/journeymap-1.20.2-5.9.18-neoforge.jar |
|          102 | unknown             | <mods>/random file.java                      |
|-------------:|---------------------|----------------------------------------------|

It's probably better to display these in a full warning message, but for now they appear in the Mod Loading State screen: Note: that has been replaced by a new screen:

This also includes a better error message for zero-byte files (when named .zip or .jar):

[AlexIIL]

I've updated this to include a proper error message with the types of unknown mods.

This also includes a link to your RGML-Quilt project, but I'm not sure if you'd want this to be added yet? (Maybe when loader plugins are stable).