edje: Split Edje headers

Now, Edje.h includes three new files:
- Edje_Eo.h: Eo API functions (functions defines, enums, base id).
- Edje_Legacy.h: contains the API functions related to objects
- Edje_Common.h: common data (structs, enums...) + functions not related to
objects.

This phase is needed for the EFL 1.8 release to disable Eo APIs if we
consider it is not enough mature to be used by applications.

src/Makefile_Edje.am

@@ -17,6 +17,9 @@ EDJE_COMMON_CPPFLAGS = -I$(top_builddir)/src/lib/efl \
 installed_edjemainheadersdir = $(includedir)/edje-@VMAJ@
 dist_installed_edjemainheaders_DATA = \
 lib/edje/Edje.h \
+lib/edje/Edje_Common.h \
+lib/edje/Edje_Eo.h \
+lib/edje/Edje_Legacy.h \
 lib/edje/Edje_Edit.h
 
 lib_edje_libedje_la_SOURCES = \