The crate containing the entry point is called alacritty, and the crate
containing everything else is called alacritty_terminal.

The cfc20d4f34dca535654cc32df18e785296af4cc5 commit introduced a
regression which would cause the cursor to disappear after the glyph
cache has been filled.

Since the cursor was not cached on the glyph cache, the cursor would
quickly fill up the OpenGL texture with lots of cursor textures and then
things would break after the atlas was filled completely.

This adds a separate cursor cache which is keyed by the cursor style
that will persist the texture without flooding the atlas.

This fixes #2355.

If a cell has a matching foreground and background and is inversed
through the escape or selection, it will now fall back to the default
background on top of the default foreground.

This makes it possible to show invisible text like this by selecting it.

Hidden text is unaffected by this change.

This fixes #2315.

Fixes #34.
Fixes #2012.

Since the block cursor inverts the background and foreground colors of a
cell, the hidden cursor has done the same thing without rendering a
cursor since it was using the block cursor shape.

A new `Hidden` cursor style has been introduced for explicitly handling
the invisible cursor differently.

This fixes #2342.

The ConPTY had a cryptic 'assertion failed: success' error whenever
spawning the shell failed.

This changes the ConPTY assertion to a human-readable error which
clearly states that the file could not be found.

The WinPTY backend has not been fixed yet.

This fixes #2016.

This fixes a recent regression in
cfc20d4f34dca535654cc32df18e785296af4cc5 which broke cursor colors when
specified in the `colors.cursor` field in the config.

It also removes a lot of unneeded code from the font crate related to
the cursor rendering.

This fixes #2338.