added gitignore
made logging level configurable
moved main file
made a program that uses println(I)V runnable
added array of opCode names
corrected logging function behaviour - no more [ ... ] when printing
show panic for NYI constants
display opCode's name when it's not yet implemented
implemented ALOAD_0
implemented POP
implemented LDC_W only loading CONSTANT_Class
corrected program counter, but not yet implemented INVOKESTATIC
spacing and elaborate PANIC message for GETSTATIC