change quit policy and add force quit

See merge request !95

Signed-off-by: amghazanfari <a.m.ghazanfari76@gmail.com>

add default file to write

See merge request !94

fix: 0 interpreted as command unless currently inputting a number

See merge request !92

Sodium updates

See merge request redox-os/sodium!91

use current syntax for inclusive range patterns

See merge request redox-os/sodium!88

Fix Issue #83 - Panic on write without filename

See merge request redox-os/sodium!87

Adding in support for arrow keys in normal mode for moving.

Remove extra parenthesis around function argument to compile

* Compiling on 1.25.0-nightly fails due to extra parenthesis around
  function arguments
  * Remove to restore successful compilation

infer file to save to from file opened

Make buffers behave more consistent

Add bd command to delete a buffer.

Fix bug when entering invalid command in prompt

The history can be accessed using the arrow keys.

Fix bug that could cause panic when deleting lines

Add line numbers, wraps lines that are too long

Completely rewrote the io/graphics.rs redraw function.

Fix freeze on resize screen, impl tab as 4 spaces

Also fixes a bug when pressing 'L' on an empty line.

Vertical scrolling & rustfmt changes

Completely prevents the cursor from walking offscreen.
Also fixes several crashes when pressing 'z'. I still don't
understand how those are supposed to work anyway, but allowing
the cursor to go offscreen is never a good idea.

Implement 'I', 'A' and 'c' commands.

Also fixes a bug where pressing 'L' would put
the cursor beyond the last character of the line.

Fix a panic when using 'dL' or 'dG'