client: Reverted adding hard coded IRC client

Because I feel as being this Friday's bad guy. And also because that
should be implemented as an extension, as discussed on IRC.

Revert "client: uncrustify IRC code"
This reverts commit 8672676ba427505e71bb98e931c488f752ac0e0a.

Revert "client: use the key constant refs #158"
This reverts commit e7db73e4e8d855883c92242389315330c27948d0.

Revert "client: IRC client update"
This reverts commit cdec30cf4192c6d42d20aa59e5176721737d1390.

Revert "client: FEATURE_IRC_CLIENT"
This reverts commit 45ba8cbbed2c462e62b32b16e695bc54a2185e13.

Revert "Uploaded missing file"
This reverts commit 0ba68a2f2d832ba111ea6acee55b7b19e0b3a349.

Revert "added possibility for ETLegacy to join on IRC server"
This reverts commit 5cc885add9e6c77c6ea6dd631cc13f2ac6e082a2.