Merge branch 'backtrace' into 'master'

Log backtrace in panic hook in Voxygen

See merge request veloren/veloren!139

Former-commit-id: 14c53ea6eaf57dbd2acf743f7b47a9916f3615fe

Cargo.lock

@@ -2350,6 +2350,7 @@ dependencies = [
 name = "veloren-voxygen"
 version = "0.2.0"
 dependencies = [
+ "backtrace 0.3.15 (registry+https://github.com/rust-lang/crates.io-index)",
  "config 0.9.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "conrod_core 0.63.0 (git+https://gitlab.com/veloren/conrod.git)",
  "conrod_winit 0.63.0 (git+https://gitlab.com/veloren/conrod.git)",

voxygen/Cargo.toml

@@ -48,3 +48,4 @@ msgbox = "0.1"
 directories = "1.0"
 portpicker = "0.1"
 num = "0.2"
+backtrace = "0.3"

voxygen/src/main.rs

@@ -138,7 +138,11 @@ The information below is intended for developers and testers.
 Panic Payload: {:?}
 PanicInfo: {}", settings_clone.log.file, reason, panic_info);
 
-        log::error!("VOXYGEN HAS PANICKED\n\n{}", msg);
+        log::error!(
+            "VOXYGEN HAS PANICKED\n\n{}\n\nBacktrace:\n{:?}",
+            msg,
+            backtrace::Backtrace::new()
+        );
 
         msgbox::create("Voxygen has panicked", &msg, msgbox::IconType::ERROR);