(fix) KVMObject#setInt()
implements gc

ObjManagerTest#testGCwork fails.
inline/Array.java must be fixed.
refc++/-- in CPU

Array has not been fixed yet.
testArrayGC

this test fails.
Fixed KArray

TODO: fix CPU instructions
Now CPU supports gc

Replaced some stack.pop() with stack.referPop() ... ve.unrefer()
CallStack#popString()
KString#getContent(VarEntry)
Memory Manager(naive)
Loader (fields,methods)

Added LoaderTest to AllTests
Added some tests