logging: Use glib as log backend instead of env_logger.

This makes log output use the same logger as gtk itself and as most other gtk applications

Cargo.lock

@@ -59,7 +59,7 @@ dependencies = [
  "cexpr",
  "clang-sys",
  "clap",
- "env_logger 0.8.4",
+ "env_logger",
  "lazy_static",
  "lazycell",
  "log",
@@ -210,19 +210,6 @@ dependencies = [
  "termcolor",
 ]
 
-[[package]]
-name = "env_logger"
-version = "0.9.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "0b2cf0344971ee6c64c31be0d530793fba457d322dfec2810c453d0ef228f9c3"
-dependencies = [
- "atty",
- "humantime",
- "log",
- "regex",
- "termcolor",
-]
-
 [[package]]
 name = "errno"
 version = "0.2.7"
@@ -415,6 +402,7 @@ dependencies = [
  "glib-sys",
  "gobject-sys",
  "libc",
+ "log",
  "once_cell",
  "smallvec",
 ]
@@ -587,7 +575,7 @@ dependencies = [
 name = "helvum"
 version = "0.3.2"
 dependencies = [
- "env_logger 0.9.0",
+ "glib",
  "gtk4",
  "log",
  "once_cell",