Change playFrame return value to boolean

We must signal that player has been stopped, signal it by setting playFrame
return value to false.

Signed-off-by: Claudio Matsuoka <cmatsuoka@gmail.com>
Merge branch 'master' of github.com:cmatsuoka/coremod-java

Signed-off-by: Claudio Matsuoka <cmatsuoka@gmail.com>

Conflicts:
	coremod/src/org/helllabs/coremod/Player.java
Fix JNI interface and cache class field IDs

Signed-off-by: Claudio Matsuoka <cmatsuoka@gmail.com>
Add missing constants from xmp.h

Signed-off-by: Claudio Matsuoka <cmatsuoka@gmail.com>