Kernel/Userspace: Add basic init process

This process parses /etc/passwd and promps login screen.
When an username is entered, it will launch that users shell

kernel/kernel/Process.cpp

@@ -300,8 +300,6 @@ namespace Kernel
 			delete range;
 		m_mapped_ranges.clear();
 
-		m_open_files.clear();
-
 		load_elf_to_memory(*elf);
 
 		m_userspace_info.entry = elf->file_header_native().e_entry;

kernel/kernel/kernel.cpp

@@ -180,7 +180,7 @@ static void init2(void* tty1)
 
 	((TTY*)tty1)->initialize_device();
 
-	MUST(Process::create_userspace({ 0, 0, 0, 0 }, "/usr/bin/Shell"sv));
+	MUST(Process::create_userspace({ 0, 0, 0, 0 }, "/usr/bin/init"sv));
 	return;
 
 	Process::create_kernel(