Certain programs like `htop` have problems with the number
of color pairs which are specified by the Alacritty terminfo
file.
By reducing the maximum number of color pairs to the value
which is specified by xterm-256color, these issues are
resolved.
This fixes#1862.
The reset cursor terminal escape sequnce specified in the terminfo file
was using xterm's `\E[2 q`. However this just resets the cursor to the
block cursor shape.
Since Alacritty supports the `\E[0 q` escape sequence for resetting the
cursor shape to the original shape specified in the configuration file,
the terminfo file has been altered to make use of this sequence instead.
This replaces the current definitions, which depend on the system's
'xterm-256color' terminfo definition with the `alacritty` and
`alacritty-direct` definitions.
The new definitions are completely standalone.
The default `TERM` value has been changed to be dynamically
set based on the definitions installed on the system. Alacritty will
try to use the `alacritty` definition first and fall back to
`xterm-256color` if the `alacritty` definition is not present.
