Rename Sigchecker to SigChecker to be more idiomatic

Idiomatic rust naming for types is "PascalCase" and this was more "Pascalcase".

fish-rust/src/builtins/wait.rs

@@ -5,7 +5,7 @@ use crate::builtins::shared::{
     STATUS_CMD_OK, STATUS_INVALID_ARGS,
 };
 use crate::ffi::{job_t, parser_t, proc_wait_any, Repin};
-use crate::signal::Sigchecker;
+use crate::signal::SigChecker;
 use crate::wait_handle::{WaitHandleRef, WaitHandleStore};
 use crate::wchar::{widestrs, wstr};
 use crate::wgetopt::{wgetopter_t, wopt, woption, woption_argument_t};
@@ -112,7 +112,7 @@ fn wait_for_completion(
         return Some(0);
     }
 
-    let mut sigint = Sigchecker::new_sighupint();
+    let mut sigint = SigChecker::new_sighupint();
     loop {
         let finished = if any_flag {
             whs.iter().any(is_completed)

fish-rust/src/io.rs

@@ -10,7 +10,7 @@ use crate::global_safety::RelaxedAtomicBool;
 use crate::job_group::JobGroup;
 use crate::path::path_apply_working_directory;
 use crate::redirection::{RedirectionMode, RedirectionSpecList};
-use crate::signal::Sigchecker;
+use crate::signal::SigChecker;
 use crate::topic_monitor::topic_t;
 use crate::wchar::{wstr, WString, L};
 use crate::wutil::{perror, wdirname, wstat, wwrite_to_fd};
@@ -789,7 +789,7 @@ pub struct FdOutputStream {
     fd: RawFd,
 
     /// Used to check if a SIGINT has been received when EINTR is encountered
-    sigcheck: Sigchecker,
+    sigcheck: SigChecker,
 
     /// Whether we have received an error.
     errored: bool,
@@ -800,7 +800,7 @@ impl FdOutputStream {
         assert!(fd >= 0, "Invalid fd");
         FdOutputStream {
             fd,
-            sigcheck: Sigchecker::new(topic_t::sighupint),
+            sigcheck: SigChecker::new(topic_t::sighupint),
             errored: false,
         }
     }

fish-rust/src/signal.rs

@@ -359,15 +359,15 @@ pub fn signal_unblock_all() {
 }
 
 /// A Sigchecker can be used to check if a SIGINT (or SIGHUP) has been delivered.
-pub struct Sigchecker {
+pub struct SigChecker {
     topic: topic_t,
     gen: generation_t,
 }
 
-impl Sigchecker {
+impl SigChecker {
     /// Create a new checker for the given topic.
     pub fn new(topic: topic_t) -> Self {
-        let mut res = Sigchecker { topic, gen: 0 };
+        let mut res = SigChecker { topic, gen: 0 };
         // Call check() to update our generation.
         res.check();
         res