Rewrote a lot of the components tree code:

- Added SF_PSELECTED for partially selected sub-sections
- SF_EXPAND now refreshes the components tree
- Fixed problems with sub-sections with RO sections as children
- (-1) sent to .onMouseOverSection when mouse over nothing
- RO sections can now be in InstTypes too (default to old behavior)
- Optimized code


git-svn-id: https://svn.code.sf.net/p/nsis/code/NSIS/trunk@2436 212acab6-be3b-0410-9dea-997c60f758d6

Source/exehead/fileform.h

@@ -437,12 +437,13 @@ typedef struct
 #define SF_BOLD       8
 #define SF_RO         16
 #define SF_EXPAND     32
+#define SF_PSELECTED  64
 
 typedef struct
 {
   int name_ptr; // '' for non-optional components
   int install_types; // bits set for each of the different install_types, if any.
-  int flags; // SF_SELECTED, SF_RO, SF_BOLD, SF_SUB, and/or SF_EXPAND
+  int flags; // SF_* - defined above
   int code;
   int code_size;
   int size_kb;