Debug reporting

[Vankka]

• Better error for illegal key size (more user friendly message and suggestion to use /discordsrv debug 128)
• Ability to store to (zip) file (maybe: /discordsrv debug zip)
  • There should probably be a hard timeout for uploading as upload has had such an infinite time to upload problem

Information to add in to debug reports:

• Automatic inspection (Automatic inspection with /discord debug DiscordSRV#287)
• basic JVM info; Java version & vendor, ... (avoid file paths for the sake of privacy (eg. user's name))
• Platform information (version, list of plugins, ...)
  • Registered Event Listeners (where possible)
• DiscordSRV information (version, JDA status, ...)
• DiscordSRV log messages
  • Debug level log messages should be on but not viewable in the console at all times (this may need our own log file)
• Configuration files
  • Parsed & non-parsed
• The bot's permissions (Guilds & Channels)

Stuff that should be dropped

• All environment variables/ system-info.txt (not very useful and potential privacy concern (user's name via file path))
• Thread stacks (isn't very useful (atleast with current & server stacks)) / threads.txt