Add a new spell pattern picker.

The picker is used in the special node dialog and also in monster abilities.

Some changes were made to the game as well:
* If the rotatable wall is used for a field missile or touch ability, there's no longer an option for the designer to pick an orientation. Instead, it behaves like the rotatable wall in a radiate field ability, selecting an orientation based on the creature's facing direction.
* The magic values sent to place_spell_pattern for direct damage were rearranged to match the order of the eDamageType enum. This should have no effect, since the core place_spell_pattern function is only called by the various wrapper overloads. It also simplifies the code quite a bit.
* The Protective Circle spell pattern is now exposed to the place patten special nodes. It can be used as just a radius 4 circle, but the effect of different layers of fields can also be obtained by specifying a field type or damage type of -1.

There is also a change to the dialog engine:
* Calling setText() also implicitly calls recalcRect()

src/scenedit/scen.keydlgs.hpp

@@ -13,6 +13,7 @@ short choose_background(short cur_choice, cDialog* parent);
 short choose_text_res(std::string res_list,short first_t,short last_t,unsigned short cur_choice,cDialog* parent,const char *title);
 short choose_text(eStrType list, unsigned short cur_choice, cDialog* parent,std::string title);
 short choose_text_editable(std::vector<std::string>& list, short cur_choice, cDialog* parent, std::string title);
+short choose_pattern(short cur_choice, cDialog* parent, bool expandRotatable);
 bool edit_text_str(short which_str,eStrMode mode);
 bool edit_spec_enc(short which_node,short mode,cDialog* parent);
 short get_fresh_spec(short which_mode);