improve large expression testcase to cover all indirect call related opcodes (NEW, CALL, CSVAR, CSREG, CSPROP)
add indirect variants of call related opcodes: CALL, NEW, CSVAR; CSREG, CSPROP
indirect call instruction execution, fix to valstack reconfig
indirect call setup and call handling in the compiler
release note update
add DUK_OPT_DEEP_C_STACK
deep c stack makefile option (commented out by default)
document DUK_OPT_DEEP_C_STACK
fixme notes for MPUTARR/MPUTOBJ which require indirect variants to work with very large expressions; they should be the last opcodes needing indirection