added a more flexible way of managing ProcEvents

modifying the global ProcEvent enum and refreshmap array is not needed
anymore. You can now register new events dynamically, using a ProcEventMapper
instance. See rtgui/localcontrast.cc for an example.

Hopefully this solves the problem of recurring merge conflicts when different
devs add different proc events

rtgui/CMakeLists.txt

@@ -149,6 +149,7 @@ set(NONCLISOURCEFILES
     zoompanel.cc
     fattaltonemap.cc
     localcontrast.cc
+    eventmapper.cc
     )
 
 include_directories(BEFORE "${CMAKE_CURRENT_BINARY_DIR}")