Merge remote-tracking branch 'origin/topic/timw/deprecation-cleanup'

Merge adjustments:
- Removed some stale str_split() references from docs
- Renumbered TypeTag enum comments
- Simplified test-case for @unload (don't need .bro files anymore)

* origin/topic/timw/deprecation-cleanup:
  Doc updates
  Fix language.init-in-anon-function btest due to changes to log filter predicates
  Remove deprecated log filter predicates for 4.1
  Remove Plugin::HookCallFunction and fix tests related to it
  Remove support for .bro script extension and BRO_ environment variables
  Remove deprecated ICMP events
  Remove some deprected methods/events from bif files
  Remove TYPE_COUNTER
  Remove all of the random single-file deprecations
  Remove all fully-deprecated files
  Update bifcl submodule to remove deprecations from generated code

scripts/base/frameworks/logging/main.zeek

@@ -210,16 +210,6 @@ export {
 		## The logging writer implementation to use.
 		writer: Writer &default=default_writer;
 
-		## Indicates whether a log entry should be recorded.
-		## If not given, all entries are recorded.
-		##
-		## rec: An instance of the stream's ``columns`` type with its
-		##      fields set to the values to be logged.
-		##
-		## Returns: True if the entry is to be recorded.
-		pred: function(rec: any): bool &optional
-			&deprecated="Remove in 4.1. PolicyHooks will replace the $pred function.";
-
 		## Output path for recording entries matching this
 		## filter.
 		##