These interfaces are basically pointless.

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.

* 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>

Change-Id: I505dd85becbfe5e5fd611a69cee7678d84fb249f
Reviewed-on: http://gerrit.dmdirc.com/3775
Automatic-Compile: DMDirc Build Manager
Reviewed-by: Greg Holmes <greg@dmdirc.com>

Change-Id: I2cf35d5859c85c3609002f126241536fda5d588e
Depends-On: I2baa7e986ded54930093768238ed24cab8cf4bf7
Reviewed-on: http://gerrit.dmdirc.com/3770
Automatic-Compile: DMDirc Build Manager
Reviewed-by: Chris Smith <chris@dmdirc.com>

Change-Id: I9b37249813c03941cdd410a5b225f3d710a72244
Reviewed-on: http://gerrit.dmdirc.com/3323
Automatic-Compile: DMDirc Build Manager
Reviewed-by: Chris Smith <chris@dmdirc.com>

Change-Id: I9c0f0cc56b11844399b95a19cc855771984d03a0
Depends-On: Iddf8113511c0b8787d182e8f6d856f10beaabd84
Reviewed-on: http://gerrit.dmdirc.com/3296
Automatic-Compile: DMDirc Build Manager
Reviewed-by: Chris Smith <chris@dmdirc.com>

Change-Id: Ibe411f36d4cfa7942562a437456c73e009b1f195
Depends-On: I7fc1dbbccda16b4c4e51f828f9192bab6a1867ff
Reviewed-on: http://gerrit.dmdirc.com/3278
Reviewed-by: Greg Holmes <greg@dmdirc.com>
Automatic-Compile: DMDirc Build Manager