Implement unimplemented opcodes

[darkf]

When walking around various maps and interacting with objects, one usually comes across unimplemented scripting opcodes. This issue will serve as a master list of known missing/unimplemented opcodes and their status.

• [x] ~~unimplemented opcode 814e (pc=26ee) in ncdrgdlr (newr1, talk to the guard in the northwest corner)~~ e799ca2

• [x] ~~unimplemented opcode 80da (pc=cd6) in qcturret (encfite)~~ 3910f53

• [x] ~~unimplemented opcode 8151 (pc=ea8) in fcfempnk/fcmalpnk (sftanker)~~ be035ad

• [x] ~~unimplemented opcode 8109 (pc=2dba) in dcorphan (denbus1)~~

• [x] ~~unimplemented opcode 80e5 (pc=b00) in dnslvrun (dnslvrun)~~ f4db78a32b0329824e1ef6ae3dd1a201bd871699

• [x] ~~unimplemented opcode 8152 (pc=18fc) in dcrunslv~~ 8260f89