Implement libinput device configuration

We need to defer config application to the first manage_start event
using a should_manage flag so that all *_support events have arrived
before we try applying the configs

This commit also has two other fixes
- fixes a potential use-after-free by telling InputDevice when a
 LibinputDevice is .removed.
- fix logFn (removed "if (scope != .default) return;")

I used kwm to help figure out the manage pattern for the input config.
Link to kwm: https://github.com/kewuaa/kwm

src/main.zig

@@ -213,11 +213,11 @@ var runtime_log_level: std.log.Level = switch (builtin.mode) {
     .ReleaseSafe, .ReleaseFast, .ReleaseSmall => .info,
 };
 
-// pub const std_options: std.Options = .{
-//     // Tell std.log to leave all log level filtering to us.
-//     .log_level = .debug,
-//     .logFn = logFn,
-// };
+pub const std_options: std.Options = .{
+    // Tell std.log to leave all log level filtering to us.
+    .log_level = .debug,
+    .logFn = logFn,
+};
 
 pub fn logFn(
     comptime level: std.log.Level,
@@ -227,8 +227,6 @@ pub fn logFn(
 ) void {
     if (@intFromEnum(level) > @intFromEnum(runtime_log_level)) return;
 
-    if (scope != .default) return;
-
     const scope_prefix = if (scope == .default) ": " else "(" ++ @tagName(scope) ++ "): ";
 
     stderr.print(level.asText() ++ scope_prefix ++ format ++ "\n", args) catch return;