Create constants & dev checks

Fixes #13

functions/checks.py

@@ -0,0 +1,15 @@
+import discord
+from data import constants
+
+
+# Checks if an author is a dev
+def isDev(ctx):
+    return ctx.author.id in constants.devIDs
+
+
+def isAdmin(ctx):
+    return isDev(ctx) or any(role.id in constants.adminRoles for role in ctx.author.roles)
+
+
+def isModPlus(ctx):
+    return isDev(ctx) or any(role.id in constants.modPlusRoles for role in ctx.author.roles)