Add skeleton files for new web UI plugin.

ui_web2/build.gradle

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+dependencies {
+  bundle group: 'com.sparkcore', name: 'spark-core', version: '4.2'
+}

ui_web2/plugin.config

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+# This is a DMDirc configuration file.
+
+# This section indicates which sections below take key/value
+# pairs, rather than a simple list. It should be placed above
+# any sections that take key/values.
+keysections:
+  metadata
+  updates
+  version
+  defaults
+
+metadata:
+  author=Chris <chris@dmdirc.com>
+  mainclass=com.dmdirc.addons.ui_web2.WebController
+  description=Web-based DMDirc user interface
+  name=ui_web2
+  nicename=Web UI
+
+updates:
+  id=81
+
+version:
+  friendly=0.0
+
+provides:
+  web ui
+
+defaults:
+
+exports:
+