core:
- implemented mc write status command;
- add feature custom initial value mc data on reset; (fix bug #1325 Daigassou! Band Brothers DX - JP)

git-svn-id: https://svn.code.sf.net/p/desmume/code/trunk@4837 5577840e-afb3-4e59-9ef3-2b7f898b1952