Complete rewrite in rust

[s0lst1ce]

The intent is to completely write the bot anew, in rust. However I don't intend to cut down on features, quite the opposite. Hence it is first necessary to implementt all current features in rust. This pull request tracks this.

Commands

• Poll
• Slapping
• Development
• Role
• Embedding
• Time
• Essentials
• config

Misc

• Document DB setup
• deploy/update script
• script to run the bot
• error handler
• document errors

[s0lst1ce]

The current DB schema goes as follows (currently using MariaDB but all types are from standard SQL)

MariaDB [botanist]> describe slaps;
+------------+---------------------+------+-----+---------+-------+
| Field      | Type                | Null | Key | Default | Extra |
+------------+---------------------+------+-----+---------+-------+
| message_id | bigint(64) unsigned | NO   | PRI | NULL    |       |
| guild_id   | bigint(64) unsigned | YES  |     | NULL    |       |
| chan_id    | bigint(64) unsigned | YES  |     | NULL    |       |
| reason     | varchar(2048)       | YES  |     | NULL    |       |
+------------+---------------------+------+-----+---------+-------+

MariaDB [botanist]> describe guilds;
+-----------------+---------------------+------+-----+---------------+-------+
| Field           | Type                | Null | Key | Default       | Extra |
+-----------------+---------------------+------+-----+---------------+-------+
| id              | bigint(64) unsigned | NO   | PRI | NULL          |       |
| welcome_message | varchar(2048)       | YES  |     | "Welcome {}!" |       |
| goodbye_message | varchar(2048)       | YES  |     | "Goodbye {}!" |       |
| advertise       | tinyint(1)          | YES  |     | 1             |       |
| admin_chan      | bigint(64) unsigned | YES  |     | NULL          |       |
| poll_chans      | bigint(64) unsigned | YES  |     | NULL          |       |
| priv_manager    | bigint(64) unsigned | YES  |     | NULL          |       |
| priv_admin      | bigint(64) unsigned | YES  |     | NULL          |       |
| priv_event      | bigint(64) unsigned | YES  |     | NULL          |       |
+-----------------+---------------------+------+-----+---------------+-------+

[s0lst1ce]

All DB interactions will now be handled through rust-db-adapter.