Fix hotkeys for macOS

Well that was a weird fix. It doesn't seem like crossterm's support for my macOS terminal is very good. Control+M generates a `KeyCode::Enter` event. All Alt+letter hotkeys generate an event for some non-ascii character with no modifiers set. You get a different character for every key you press with Alt. It seems like maybe some or all of this issue might be being tracked at crossterm-rs/crossterm#685

Plus I'm trying to avoid default macOS hotkeys. I also updated crossterm hoping that it would address some of the above problems but it did not.

So yeah, a little bit of a messy update.

Cargo.toml

@@ -7,6 +7,6 @@ repository = "https://github.com/bytesized/utilities"
 
 [dependencies]
 clap = { version = "4.0.29", features = ["derive"] }
-crossterm = "0.25.0"
+crossterm = "0.28.1"
 num = "0.4.2"
 rusqlite = { version = "0.28.0", features = ["bundled"] }

README.md

@@ -44,14 +44,13 @@ Control+D exits on all operating system including when using `-a`.
 
 bcalc supports several navigation hotkeys:
 
- - Larger movement distance with arrow keys by additionally using Control
- - Control+M when the cursor is over a parenthesis to jump to the matching one.
+ - Larger movement distance with arrow keys by additionally using Control or Shift.
+ - Control+N when the cursor is over a parenthesis to jump to the matching one.
 
 ## TODO
 
 This project is still a work in progress. A number of features are planned or do not yet work properly:
 
- - Fix navigation hotkeys. They don't seem to be working right, at least on macOS.
  - Allow argument configuration values to be saved.
  - Enable more detailed errors that point at the location of the error in the input.
  - Add a `/quit` command.