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>