DMDirc/DMDirc#750

Stop swimming against the tide and accept what most of the rest of
the world does.

While it adds an annoying depth to the actual source code, it makes
the root directory nicer (no more 'test-res' dirs), means we don't
have to override the gradle config, and makes it nicer to work in
IDEA 2016.1.

This maintains a FileSystem pointing at the jar the application is
running from, which can be used to get Paths for bundled resources.

Change-Id: I20d3a7b908bbeae833ffffe0598b99bde47021c7
Reviewed-on: http://gerrit.dmdirc.com/4073
Reviewed-by: Chris Smith <chris@dmdirc.com>
Automatic-Compile: DMDirc Build Manager

FileSystems aren't as automatic as I expected :(

Change-Id: I5fe47086e86e3812dfa463bf1125ae02d1df3633
Reviewed-on: http://gerrit.dmdirc.com/4062
Reviewed-by: Greg Holmes <greg@dmdirc.com>
Automatic-Compile: DMDirc Build Manager

Don't try and resole using a path from another FS provider.

Create paths via URIs not via strings, as otherwise it gets
confused with protocols.

Change-Id: Ibb33317ee9ce8d1567535e464c8f59667ea5e65a
Reviewed-on: http://gerrit.dmdirc.com/4043
Reviewed-by: Greg Holmes <greg@dmdirc.com>
Automatic-Compile: DMDirc Build Manager

Not tested or used yet :)

Change-Id: If34cc6520c3d05ed33c6d82eac2e2fbcba99a688
Reviewed-on: http://gerrit.dmdirc.com/4042
Automatic-Compile: DMDirc Build Manager
Reviewed-by: Greg Holmes <greg@dmdirc.com>