Userland: Remove "Inspector" program and related utilities

This program has never lived up to its original idea, and has been
broken for years (property editing, etc). It's also unmaintained and
off-by-default since forever.

At this point, Inspector is more of a maintenance burden than a feature,
so this commit removes it from the system, along with the mechanism in
Core::EventLoop that enables it.

If we decide we want the feature again in the future, it can be
reimplemented better. :^)

Base/usr/share/man/man1/Applications.md

@@ -26,7 +26,6 @@ Note that many applications can be disabled at SerenityOS build time if desired.
 - [GML Playground](help://man/1/Applications/GMLPlayground)
 - [Hex Editor](help://man/1/Applications/HexEditor)
 - [Image Viewer](help://man/1/Applications/ImageViewer)
-- [Inspector](help://man/1/Applications/Inspector)
 - [Magnifier](help://man/1/Applications/Magnifier)
 - [Mail](help://man/1/Applications/Mail)
 - [Mouse Settings](help://man/1/Applications/MouseSettings)

Base/usr/share/man/man1/Applications/Inspector.md

@@ -1,31 +0,0 @@
-## Name
-
-![Icon](/res/icons/16x16/app-inspector.png) Inspector - Serenity process inspector
-
-[Open](file:///bin/Inspector)
-
-## Synopsis
-
-```**sh
-$ Inspector [pid]
-```
-
-## Arguments
-
-* `pid`: Process ID to inspect
-
-## Description
-
-Inspector facilitates process inspection via RPC.
-
-To inspect a process, it must have `MAKE_INSPECTABLE=1` in its environment,
-and it must have previously allowed the
-[`accept`(2)](help://man/2/accept) system call with
-[`pledge`(2)](help://man/2/pledge) to allow inspection
-via UNIX socket.
-
-## Examples
-
-```sh
-$ Inspector $(pidof Shell)
-```

Base/usr/share/man/man1/bt.md

@@ -41,8 +41,6 @@ $ watch -n 1 -- bt 124
 
 ## See also
 
-* [`Inspector`(1)](help://man/1/Applications/Inspector)
-
 * [`Profiler`(1)](help://man/1/Applications/Profiler)
 
 * [`watch`(1)](help://man/1/watch)

Base/usr/share/man/man7/Tips-and-Tricks.md

@@ -52,11 +52,6 @@ This is a list of useful tips and tricks to help you make the most out of Sereni
 
 ## Development
 * Supplying `# profile` with a process identifier (PID) of `-1` as root enables systemwide profiling.
-* Make applications inspectable by including `MAKE_INSPECTABLE=1` in their environment. Inspectable processes can be examined with [Inspector](help://man/1/Applications/Inspector) via remote procedure calls (RPCs). For example, to make the Eyes application inspectable, enter the following Shell commands:
-```sh
-$ export MAKE_INSPECTABLE=1
-$ Eyes &
-```
 
 ## See also
-* [Keyboard Shortcuts](help://man/7/KeyboardShortcuts)
+* [Keyboard Shortcuts](help://man/7/KeyboardShortcuts)