new applets app for cross-board usage of Applet() & UserApplet() models; dashboard migrations reset and apps reseeded w. new default specs; core.settings & many tests thru-out suite updated accordingly

src/apps/applets/models.py

@@ -0,0 +1,34 @@
+from django.db import models
+
+class Applet(models.Model):
+    DASHBOARD = "dashboard"
+    GAMEBOARD = "gameboard"
+    CONTEXT_CHOICES = [
+        (DASHBOARD, "Dashboard"),
+        (GAMEBOARD, "Gameboard"),
+    ]
+
+    slug = models.SlugField(unique=True)
+    name = models.CharField(max_length=100)
+    context = models.CharField(max_length=20, choices=CONTEXT_CHOICES, default=DASHBOARD)
+    default_visible = models.BooleanField(default=True)
+    grid_cols = models.PositiveSmallIntegerField(default=12)
+    grid_rows = models.PositiveSmallIntegerField(default=3)
+
+    def __str__(self):
+        return self.name
+    
+class UserApplet(models.Model):
+    user = models.ForeignKey(
+        "lyric.User",
+        related_name="user_applets",
+        on_delete=models.CASCADE,
+    )
+    applet = models.ForeignKey(
+        Applet,
+        on_delete=models.CASCADE,
+    )
+    visible = models.BooleanField(default=True)
+
+    class Meta:
+        unique_together = ("user", "applet")