Normalize paths before inserting them in the virtual filesystem

If we don't do this, then memory files passed using patchparams to asar_patch_ex won't be found unless they are equal to their normalized form. 
E.g. if you pass a memory file with a path "Test.asm", and a patch has "incsrc Test.asm", asar will check if "test.asm" exists in the vfs and it won't find it, leading to an error.

Author: Atari2

src/asar/virtualfile.cpp

@@ -259,8 +259,9 @@ virtual_filesystem::virtual_file_type virtual_filesystem::get_file_type_from_pat
 
 void virtual_filesystem::add_memory_file(const char* name, const void* buffer, size_t length) {
 	memory_buffer mem_buf = { buffer, length };
-	m_memory_files.remove(name);
-	m_memory_files.create(name) = mem_buf;
+	string normalized_path = normalize_path(name);
+	m_memory_files.remove(normalized_path);
+	m_memory_files.create(normalized_path) = mem_buf;
 
 }