New captcha, custom emoji, bugfixes

If you want to move from Clover you will have to do so manually. Over-installing v3.0.3 does not work.

Please read the cumulative changelog for all features/fixes from Clover.
This is a quick bugfix for v4.2.3 due to ONE missing keyword.

Added:

• New captcha is once again the default and works flawlessly; thanks to @K1rakishou for his work once again
• Custom emoji support, easy enough to add in new ones by adding an asset and writing two lines of code
  • Try it out with :you:

Fixed:

• A crash when not using API 28 and trying to reencode
• A crash when below API 26 and setting reencode quality or scale to 0 by preventing values below 0
• #61, An issue where 4chan links worked externally, but 4channel links didn't
• Cleanup some extraneous log statements clogging up the developer logs