Builtin profiler: Capture Tracy zones; And small improvements (#16479)

* Feature: Use the builtin profiler to automatically make zones for mod callback functions.
* Doc: Basic doc for builtin profiler, and better `/profiler` chatcommand help.
* Fix: `register_functions` (table of callback register function names), and `entity_instrumentation` is no longer outdated.
* Fix: Builtin profiler output is no longer printed to debug.txt or to file in world with translation escapes.
* Fix: Entity callback name generation used `obj_def.label` (normally non-existing field), now it uses the entity name.
* Small code improvements, like use of new `Settings.get_bool` with default.

.luacheckrc

@@ -20,6 +20,7 @@ read_globals = {
 	"profiler",
 	"Settings",
 	"ValueNoise", "ValueNoiseMap",
+	"tracy",
 
 	string = {fields = {"split", "trim"}},
 	table  = {fields = {"copy", "copy_with_metatables", "getn", "indexof", "keyof", "insert_all"}},