add: emul_reg_set, emul_reg_get

Changes to be committed: ...

new file:   MakefileInst
	modified:   emul.c
	modified:   emul_inst_decipher.c
	modified:   emul_inst_decipher.h
	new file:   emul_inst_exec.c
	new file:   emul_inst_exec.h
	modified:   emul_inst_isa.h
	modified:   emul_reg.h
	new file:   test_asm/test.asm

Modify: Makefile, emul.c

initial commit