LibELF: Remove ELF::Loader and move everyone to ELF::Image

This commit gets rid of ELF::Loader entirely since its very ambiguous
purpose was actually to load executables for the kernel, and that is
now handled by the kernel itself.

This patch includes some drive-by cleanup in LibDebug and CrashDaemon
enabled by the fact that we no longer need to keep the ref-counted
ELF::Loader around.

Kernel/CMakeLists.txt

@@ -224,7 +224,6 @@ set(AK_SOURCES
 
 set(ELF_SOURCES
     ../Libraries/LibELF/Image.cpp
-    ../Libraries/LibELF/Loader.cpp
     ../Libraries/LibELF/Validation.cpp
 )
 

Kernel/Syscalls/module.cpp

@@ -29,7 +29,7 @@
 #include <Kernel/KSyms.h>
 #include <Kernel/Module.h>
 #include <Kernel/Process.h>
-#include <LibELF/Loader.h>
+#include <LibELF/Image.h>
 
 namespace Kernel {