Released on 2021-11-11.

The main purpose of this release is to bring you the new hybrid graphics/text
console in the form of a feature preview. This feature brings EndBASIC closer
to its original secret goal, which is to become a platform with which to write
simple retro-looking games.

Please be aware that the new console is still quite rudimentary. There are
many missing drawing primitives, and performance isn't great yet. Fixing these
might require changes in the APIs so any code you write might need to be updated
in the future. But, remember that the same is true for all of EndBASIC right
now given its 0.x state.

This release lines up with the Handmade Seattle 2021 conference, during which it
was first announced.

Graphics support and related console changes:

• Added a graphical console based on SDL2 behind a new optional sdl
  feature. This is to support graphics on all desktop platforms and has been
  confirmed to work on FreeBSD, Linux, macOS, and Windows.

• Added the GFX_LINE, GFX_PIXEL, GFX_RECT, GFX_RECTF, and GFX_SYNC
  graphics commands.

• Added the INKEY function. This is especially useful to implement event
  loops in graphical applications.

• Fixed LOCATE so that the first argument is the column number and the
  second argument is the row number. It should always have been this way
  (in fact, this is the syntax exposed by Locomotive BASIC), but this is now
  necessary to match the ordering of the coordinates in all graphics commands
  and avoid confusion.

• Modified console facilities (including PRINT and INPUT) so that they do
  not clear lines up to the right margin. I had originally added this as a
  feature so that changing the background color in the REPL caused all
  subsequent lines to be formatted consistently, but this prevented composing
  overlapping text (with or without graphics), which is a necessary thing to
  do when rendering UIs.

• Rewrote the web frontend from scratch to support graphics rendering. This
  implies that we do not use xterm.js any more and instead use a
  custom-built console implementation. Beware of new bugs.

• Issue #67: Keyboard input on Android should now work when using a soft
  keyboard. This isn't perfect due to limitations in the Android web APIs
  but should do the trick for simple uses.

General command changes:

• Extended the CLEAR and NEW commands so that they reset various
  properties of the machine, not just variables. This includes the state of
  the console, whose color and video syncing bit are reset, and the GPIO
  pins, which are set to their default state.

• Modified the RUN command to issue a CLEAR upfront. Maintaining the
  previous state of the machine was just too confusing and error-prone due
  to side-effects causing execution failures.

• Added the MIND, MINI, MAXD, and MAXI functions.

• Added the DEG and RAD trigonometric commands and the ATN, COS,
  PI, SIN, and TAN functions. These are often needed to render
  graphics.

Interactivity improvements:

• Added support for the Home, End, Page Up, and Page Down keys in the text
  editor.

• Made the Backspace and Tab keys aware of indentation in the editor.

• Added support for the Home and End keys in text input fields.

• Modified the storage commands to keep track of the currently-loaded program
  path so that the editor can display it, so that LOAD, EXIT, and NEW
  can warn about unsaved changes, and so that SAVE can reuse the current
  filename.

Internal changes:

• Refactored the endbasic-std crate to minimize optional features in
  library crates by moving the textual console into a new endbasic-terminal
  crate, the SDL console into a new endbasic-sdl crate, and the Raspberry
  Pi support into a new endbasic-rpi crate.

• Added a new endbasic-repl crate to assimilate all of the features and
  code that are specific to the REPL. This finally breaks the dependency
  of the endbasic-web crate on the endbasic CLI crate, which required
  optional features to work.