Overhaul scaninc to work recursively

This also fixes the bug where scaninc would ignore #include lines
in assembly files.

tools/scaninc/asm_file.cpp

@@ -64,7 +64,8 @@ IncDirectiveType AsmFile::ReadUntilIncDirective(std::string &path)
 
         IncDirectiveType incDirectiveType = IncDirectiveType::None;
 
-        if (PeekChar() == '.')
+        char c = PeekChar();
+        if (c == '.' || c == '#')
         {
             m_pos++;