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 makes the plugins include their version in the output file
name, and when used as a dependency.

Also create a dist-versioned directory which accumulates versioned
plugins.

* Move all plugins to their own top-level directories.
* Move resources out of source trees
* Add Gradle build scripts.
* Remove ivy and ant build scripts.

Change-Id: Ib69a48ef26800c174ccf51c84ff9d1f73529460f
Depends-On: I303b6b69518468f98d48d835b8f40135d9e4bcbf
Reviewed-on: http://gerrit.dmdirc.com/3850
Automatic-Compile: DMDirc Build Manager
Reviewed-by: Greg Holmes <greg@dmdirc.com>

Depends-On: I34d7849a75cd4c7a91e04a9dad6f8073aa5a8f61
Change-Id: I65d96f91e1eb5ed7afb43dd41cd00531d809878d
Reviewed-on: http://gerrit.dmdirc.com/2736
Automatic-Compile: DMDirc Build Manager
Reviewed-by: Greg Holmes <greg@dmdirc.com>

Change-Id: I4f0ae98d92e106e72388b81e1c7747f9a7ed68a6
Reviewed-on: http://gerrit.dmdirc.com/2569
Reviewed-by: Chris Smith <chris@dmdirc.com>
Automatic-Compile: DMDirc Build Manager

Change-Id: I7d5a1d15689723fe21d0dfded6a76e2d80025e23
Reviewed-on: http://gerrit.dmdirc.com/1657
Automatic-Compile: DMDirc Local Commits <dmdirc@googlemail.com>
Reviewed-by: Greg Holmes <greg@dmdirc.com>