Move start command to the system commands.

Commands are split up into 3 categories: System, Admin and User.
They can be overridden individually by custom command directories.
STILL ALPHA STAGE!

Excody fix

Fixes typo in word Webhook

Just inherit repeating documentation blocks

Merge branch 'some_code_cleanup' of https://github.com/akalongman/php-telegram-bot into some_code_cleanup

# Via Armando Lüscher (1) and Marco Boretto (1)
* 'some_code_cleanup' of https://github.com/akalongman/php-telegram-bot:
  Clean Admin commands, removing all unnecessary or unused code.
  Small typo fixes.
  Remove all unused `use` definitions.
  Remove any unnecessary code from commands. Changes include: - Removed the definitions of member variables that had the same values as their inherited defaults. These can be removed since the default values apply anyway. - Removed superfluous code form execute command.

Conflicts:
	src/Admin/ChatsCommand.php
	src/Admin/SendtoallCommand.php
	src/Admin/SendtochannelCommand.php
	src/Commands/ChannelchatcreatedCommand.php
	src/Commands/ChoseninlineresultCommand.php
	src/Commands/DateCommand.php
	src/Commands/DeletechatphotoCommand.php
	src/Commands/EchoCommand.php
	src/Commands/GenericCommand.php
	src/Commands/GenericmessageCommand.php
	src/Commands/GroupchatcreatedCommand.php
	src/Commands/HelpCommand.php
	src/Commands/InlinequeryCommand.php
	src/Commands/LeftchatparticipantCommand.php
	src/Commands/NewchatparticipantCommand.php
	src/Commands/NewchattitleCommand.php
	src/Commands/SlapCommand.php
	src/Commands/StartCommand.php
	src/Commands/SupergroupchatcreatedCommand.php
	src/Commands/WeatherCommand.php
	src/Commands/WhoamiCommand.php

Remove any unnecessary code from commands.

Correct readme and examples

Prettify example code files.

Changes include:
- Removed the definitions of member variables that had the same values as their inherited defaults. These can be removed since the default values apply anyway.
- Removed superfluous code form execute command.

Fixed #86 in the process

Hello! In this file i fixed bug with new and left chat participant.

Code cleanup for TelegramException.php

Code cleanup for `Commands`

Some typo corrections.

Initial code cleanup of `Admin commands`.

Smaller typo fixes.