Fix topic bar erroring on config change.

Fixes-Issue: CLIENT-509
Change-Id: Id834a1dae721945829607296b62768b134768cbf
Reviewed-on: http://gerrit.dmdirc.com/3490
Automatic-Compile: DMDirc Build Manager
Reviewed-by: Chris Smith <chris@dmdirc.com>
Use events not actions in nick colour plugin.

Depends-On: Id53eb0fba852cf19e80dbd51d6b45fc9fc3dbee6
Change-Id: I1673d5f95a3bb702531ffb4539ceb186952db41a
Reviewed-on: http://gerrit.dmdirc.com/3492
Automatic-Compile: DMDirc Build Manager
Reviewed-by: Chris Smith <chris@dmdirc.com>
Fixes for from removing unknown_command action.

Depends-On: Ibcfc059d943a64494842eab68428ea8351206a09
Change-Id: I06ee87cf6f7795eb3ee07828fb43f4381a465ac3
Reviewed-on: http://gerrit.dmdirc.com/3491
Automatic-Compile: DMDirc Build Manager
Reviewed-by: Chris Smith <chris@dmdirc.com>