mxblocks 0.1.1

Rich message blocks (buttons, tables, charts, forms, ...) for Matrix bots: types, validation and the content-key compat rules
Documentation 
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code + diff demo. tiny bpaf derive cli, then the patch adding --rich:
```rust
use bpaf::Bpaf;

#[derive(Debug, Clone, Bpaf)]
#[bpaf(options, version)]
/// send a message as a bot
struct Say {
    /// seconds to wait for the reply
    #[bpaf(argument("TIMEOUT"), fallback(30))]
    timeout: u64,
    /// the bot to send as
    #[bpaf(positional("NAME"))]
    name: String,
}

fn main() {
    let opts = say().run();
    println!("{opts:?}");
}
```
```diff
--- a/src/say.rs
+++ b/src/say.rs
@@ -6,6 +6,9 @@ struct Say {
     #[bpaf(argument("TIMEOUT"), fallback(30))]
     timeout: u64,
+    /// a full mxblocks payload: JSON, @FILE or -
+    #[bpaf(argument("JSON"), optional)]
+    rich: Option<String>,
     /// the bot to send as
     #[bpaf(positional("NAME"))]
     name: String,
```