Fill in a lot of missed cases (mostly just messages)

- Increase strength of slayer weapons that weren't in the original BoE by making sure that each race applies some multiplier to the ability strength
- Messages for every occasional status effect, both negative and positive. If charm/forcecage, ignore.
- Fix weapon poison not being applied
- Forcecage supported for damaging terrain (in town only, of course) and "affect status" items
- Weapon poison supported for "affect status" items; it differs from "poison weapon" items in that it honours the magic use type and doesn't risk messing up (like the Envenom spell)
- Show error messages when encountering an unimplemented spell or special node
- Fix missing handling of NPCs appearing after town dies when loading a saved town

src/dialogxml/button.cpp

@@ -11,6 +11,7 @@
 #include <vector>
 #include <map>
 #include <stdexcept>
+#include <algorithm>
 
 #include "dialog.hpp"
 #include "graphtool.hpp"
@@ -530,6 +531,11 @@ void cButton::setBtnType(eBtnType newType){
 			frame.width() = 30;
 			frame.height() = 30;
 			break;
+		case BTN_TINY:
+		case BTN_LED:
+			frame.width() = std::min<int>(frame.width(), 14);
+			frame.height() = std::min<int>(frame.height(), 10);
+			break;
 	}
 }