Fix rust 1.86 clippy warnings

* [`manual_div_ceil`]
* [`sliced_string_as_bytes`]
* Add `cargo.toml` for global clippy settings, e.g. msrv

[`manual_div_ceil`]: <https://rust-lang.github.io/rust-clippy/master/index.html#manual_div_ceil>
[`sliced_string_as_bytes`]: <https://rust-lang.github.io/rust-clippy/master/index.html#sliced_string_as_bytes>

Author: Kijewski

clippy.toml

@@ -0,0 +1 @@
+msrv = "1.81.0"

examples/actix-web-app/clippy.toml

@@ -0,0 +1 @@
+../../clippy.toml

examples/axum-app/clippy.toml

@@ -0,0 +1 @@
+../../clippy.toml

examples/poem-app/clippy.toml

@@ -0,0 +1 @@
+../../clippy.toml

examples/rocket-app/clippy.toml

@@ -0,0 +1 @@
+../../clippy.toml

examples/salvo-app/clippy.toml

@@ -0,0 +1 @@
+../../clippy.toml

examples/warp-app/clippy.toml

@@ -0,0 +1 @@
+../../clippy.toml

fuzzing/clippy.toml

@@ -0,0 +1 @@
+../clippy.toml

rinja/clippy.toml

@@ -0,0 +1 @@
+../clippy.toml

rinja_derive/clippy.toml

@@ -0,0 +1 @@
+../clippy.toml

rinja_derive/src/generator/expr.rs

@@ -191,7 +191,7 @@ impl<'a> Generator<'a, '_> {
             [] => unreachable!(),
             [expr] => self.visit_expr(ctx, buf, expr),
             exprs => {
-                let (l, r) = exprs.split_at((exprs.len() + 1) / 2);
+                let (l, r) = exprs.split_at(exprs.len().div_ceil(2));
                 buf.write("rinja::helpers::Concat(&(");
                 self.visit_concat(ctx, buf, l)?;
                 buf.write("), &(");

rinja_derive_standalone/clippy.toml

@@ -0,0 +1 @@
+../clippy.toml

rinja_parser/clippy.toml

@@ -0,0 +1 @@
+../clippy.toml

rinja_parser/src/lib.rs

@@ -183,7 +183,7 @@ impl<'a> Span<'a> {
 impl<'a> From<&'a str> for Span<'a> {
     #[inline]
     fn from(value: &'a str) -> Self {
-        Self(value[..0].as_bytes().try_into().unwrap())
+        Self(value.as_bytes()[..0].try_into().unwrap())
     }
 }
 

testing-alloc/clippy.toml

@@ -0,0 +1 @@
+../clippy.toml

testing-no-std/clippy.toml

@@ -0,0 +1 @@
+../clippy.toml

testing/clippy.toml

@@ -0,0 +1 @@
+../clippy.toml