Initial: Add load commands and developer cog

The commands `load`, `unload`, `reload` were added in the main `bot.py` file. With these one can dynamically load extensions like discord cogs.
The cog `developer` has some test commands and listeners. It also has a command to shut down the bot (and therefore the python program).

src/bot.py

@@ -24,5 +24,27 @@ if TOKEN is None:
 
 bot = commands.Bot(command_prefix=commands.when_mentioned_or('$b '))
 
+default_extensions = ['developer']
+
+for extension in default_extensions:
+	bot.load_extension(f'cogs.{extension}')
+
+@bot.command()
+@commands.is_owner()
+async def load(ctx, extension):
+	bot.load_extension(f'cogs.{extension}')
+	print(f'cogs.{extension} loaded')
+
+@bot.command()
+@commands.is_owner()
+async def unload(ctx, extension):
+	bot.unload_extension(f'cogs.{extension}')
+	print(f'cogs.{extension} unloaded')
+
+@bot.command()
+@commands.is_owner()
+async def reload(ctx, extension):
+	bot.reload_extension(f'cogs.{extension}')
+	print(f'cogs.{extension} reloaded')
 
 bot.run(TOKEN)

src/cogs/developer.py

@@ -0,0 +1,27 @@
+import discord
+from discord.ext import commands
+
+
+class Developer(commands.Cog):
+	"""This class is intended only for the developer, mainly for testing purposes"""
+
+	def __init__(self, bot):
+		self.bot = bot
+
+	@commands.Cog.listener()
+	async def on_ready(self):
+		await self.bot.change_presence(status=discord.Status.online, activity=discord.Game('$b help'))
+		print('We have logged in as {0.user}'.format(self.bot))
+
+	@commands.command()
+	async def hello(self, ctx):
+		await ctx.send(f"Hello {ctx.message.author.name} :wave:")
+
+	@commands.command()
+	@commands.is_owner()
+	async def logout(self, ctx):
+		"""Shut down the bot"""
+		await self.bot.logout()
+
+def setup(bot):
+	bot.add_cog(Developer(bot))