Youtube title embedding, bottom input fixes

Next anticipated release: End of September probably. WoW Classic, y'know.

Major changes:

• #55, Youtube links now have their titles embedded in place of their URL.
• #322, change splash screen to be just the logo with a slight green glow on a black background; unfortunately I am unable to use your selected theme as the splash screen background due to how Android uses this method of the splash screen before any code is actually executed (i.e. it's all in the manifest, and that can't be dynamic).
• #238, single tapping on an image in immersive mode will open up the navigation UI and tapping it again afterwards will close the pager as usual. This does not work with GIFs and WEBMs, as they have their own single-tap functionality that I am not going to override; swipe down from the top of your screen for these types of media.

Minor changes:

• #330, (USER WAS BANNED FOR THIS POST) messages on 4chan will now show up as bolded and red instead of just bold.
• #317, bottom inputs won't jump to the top of the screen after switching reply input pages (input/auth/loading).
• #315, bottom inputs now correctly pad the list layout, so you won't have a chunk of empty space at the top of a thread.
• The more arrow in the reply input now points the correct direction based on if you are using bottom inputs or not.
• #311, #314, #316, changes to fix the reply button not correctly functioning after the bottom inputs were added.
• Filter highlighted posts are hideable and removable now.
• #328, the board menu search searches by board prefix now, so you should have better search results.
• #321, remove the GFM-Issues Flexmark extension due to some weird crash on Android 5 version check. Wasn't really useful anyways.
• #289, fixes a weird bug where sometimes the snackbar would remain behind and not hide itself when rapidly switching threads.
• #303 part 2, if the comment box of a reply input is unfocused, the keyboard will close.
• #90, the padding for the list layout will correctly be updated when you attach/detach an image in the reply input. This lets you see the OP when replying in small threads.
• #312, the "view live/local" menu items won't be visible unless you have thread downloading enabled, and the thread is being downloaded.
• #327, the post options image view has been shrunk a little bit to accomodate some issues with it overlapping text in the post comment. This also lets the title fit more into the space.
• #326, fixes an issue where some stickied posts couldn't have their links clicked.

Project level notes:

• None.