Mouse over icons on source (on Symbol and Characters)

Rename class Glyph in Decoration to Character ('Glyph' was used in system X typedef). Added MouseOver in Mixing and Layers view to show highlight color on icons of Symbol and Initials of source. Show left panel on clic on source Initials.

src/Source.h

@@ -38,7 +38,7 @@ class FrameBufferSurface;
 class Frame;
 class Handles;
 class Symbol;
-class Glyph;
+class Character;
 class CloneSource;
 class MixingGroup;
 
@@ -316,7 +316,7 @@ protected:
     Handles *lock_, *unlock_;
     Switch *locker_;
     Symbol *symbol_;
-    Glyph  *initial_0_, *initial_1_;
+    Character  *initial_0_, *initial_1_;
 
     // update
     bool  active_;