Various code edits:
* Implemented more HookCalls/MakeCalls/SafeWriteBatch in code.
* Moved return/jump address consts into their respective functions.
* Changed for-loop with iterators to use pre-increment.
* it changes the behavior of vanilla division operator to use signed
integer division. Before it used signed division for floats but
unsigned for integers.
Added a new "div" operator for unsigned integer division.
Moved mathematical script functions from Utils.cpp to new Math.cpp.
Added include guard to sfall.h and main.h in modders pack.
* combined related engine interpreter functions into a single function
for aligning the compiled ASM code better.
Minor changes to some other code and documents.
* calling endgame_movie now plays Movie11 or Movie12 depending on
the player's gender before the credits.
Added new flags to force_encounter_with_flags function.
(also fixed the issue of DialogGenderWords mentioned in previous commit)
Fixed AI disposition values in define_extra.h.
Minor code edits to world map travel markers.
Fixed the return value of charcode script function for characters in
the extended ASCII character set.
Rewrote set_dm/df_model, set_movie_path functions in C++.
NovaRain