Implement lastfm support

[Simon Trahan]

I would be nice to be able to interface the lastfm player, at least for the supported options (i.e. no "previous track" command, etc.).
Ref: http://www.last.fm/download
(P.S. Sorry for the imperative form on the bug report; I used the same form that was used for other player support)

[Paul Kuliniewicz (kuliniew)]

Version 1.4.2.58240 of the last.fm client doesn't build:

g++ -c -pipe -O2 -w -fPIC -DNBREAKPAD -DLINUX -DNDEBUG -I/usr/share/qt4/mkspecs/linux-g++ -I. -I../../../../src -I../../../../build -I../../../libMoose -I../../../libUnicorn -I../include -I../src -I../../libs/fftw/src/api -I../../../../res/libsamplerate -o ../../../../build/fplib/release/FingerprintExtractor.o ../src/FingerprintExtractor.cpp
../src/FingerprintExtractor.cpp: In member function ‘bool fingerprint::FingerprintExtractor::process(const short int*, size_t, bool)’:
../src/FingerprintExtractor.cpp:445: error: ‘memcpy’ was not declared in this scope
make[1]: *** [../../../../build/fplib/release/FingerprintExtractor.o] Error 1
make[1]: Leaving directory `/home/paul/src/last.fm-1.4.2.58240/src/libFingerprint/fplib/pro_qmake'
make: *** [sub-src-libFingerprint-fplib-pro_qmake-fplib-pro-make_default-ordered] Error 2