ui code -> extend 'active' system to all left/middle/right mouse buttons, rather than just min/max (left/right)

src/base/base_types.h

@@ -170,6 +170,9 @@
 #define DeferLoop(begin, end)        for(int _i_ = ((begin), 0); !_i_; _i_ += 1, (end))
 #define DeferLoopChecked(begin, end) for(int _i_ = 2 * !(begin); (_i_ == 2 ? ((end), 0) : !_i_); _i_ += 1, (end))
 
+#define EachEnumVal(type, it) type it = (type)0; it < type##_COUNT; it = (type)(it+1)
+#define EachNonZeroEnumVal(type, it) type it = (type)1; it < type##_COUNT; it = (type)(it+1)
+
 #if LANG_CPP
 # define zero_struct {}
 #else