move IRC server settings to database

this is the first step in trying to get the bot to support multiple
servers with different channels, countdown triggers, and so on

this also ends up affecting some configuration around:
* dispatch
* markov
* admin privmsg form

ircbot/migrations/0015_ircserver.py

@@ -0,0 +1,32 @@
+# Generated by Django 3.1.2 on 2021-04-25 14:05
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('ircbot', '0014_auto_20160116_1955'),
+    ]
+
+    operations = [
+        migrations.CreateModel(
+            name='IrcServer',
+            fields=[
+                ('id', models.AutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
+                ('name', models.CharField(max_length=200, unique=True)),
+                ('hostname', models.CharField(max_length=200)),
+                ('port', models.PositiveSmallIntegerField(default=6667)),
+                ('password', models.CharField(blank=True, default=None, max_length=200, null=True)),
+                ('nickname', models.CharField(max_length=32)),
+                ('realname', models.CharField(blank=True, default='', max_length=32)),
+                ('additional_addressed_nicks', models.TextField(blank=True, default='', help_text='For e.g. BitlBee alternative nicks')),
+                ('use_ssl', models.BooleanField(default=False)),
+                ('use_ipv6', models.BooleanField(default=False)),
+                ('post_connect', models.TextField(blank=True, default='')),
+                ('delay_before_joins', models.PositiveSmallIntegerField(default=0)),
+                ('xmlrpc_host', models.CharField(default='localhost', max_length=200)),
+                ('xmlrpc_port', models.PositiveSmallIntegerField(default=13132)),
+            ],
+        ),
+    ]

ircbot/migrations/0016_placeholder_ircserver.py

@@ -0,0 +1,26 @@
+# Generated by Django 3.1.2 on 2021-04-25 04:11
+
+from django.db import migrations
+
+
+def create_placeholder_server(apps, schema_editor):
+    """Create the first server entry, to be configured by the admin."""
+    IrcServer = apps.get_model('ircbot', 'IrcServer')
+    IrcServer.objects.create(name='default', hostname='irc.example.org', port=6667)
+
+
+def delete_placeholder_server(apps, schema_editor):
+    """Remove the default server."""
+    IrcServer = apps.get_model('ircbot', 'IrcServer')
+    IrcServer.objects.filter(name='default').delete()
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('ircbot', '0015_ircserver'),
+    ]
+
+    operations = [
+        migrations.RunPython(create_placeholder_server, delete_placeholder_server),
+    ]