Separated the emulation features in a module.

Add a new command line option --feature that allows to set emulation
features from the command line.


git-svn-id: svn://svn.cc65.org/cc65/trunk@311 b7a2c559-68d2-44c3-8de9-860c34a00d81

src/ca65/make/gcc.mak

@@ -14,6 +14,7 @@ OBJS =  condasm.o	\
 	ea.o	      	\
         error.o	      	\
         expr.o	      	\
+	feature.o	\
 	filetab.o	\
 	fragment.o	\
         global.o       	\

src/ca65/make/watcom.mak

@@ -72,6 +72,7 @@ OBJS = 	condasm.obj	\
 	ea.obj		\
 	error.obj	\
 	expr.obj	\
+	feature.obj	\
 	filetab.obj	\
 	fragment.obj	\
 	global.obj	\
@@ -118,6 +119,7 @@ FILE dbginfo.obj
 FILE ea.obj
 FILE error.obj
 FILE expr.obj
+FILE feature.obj
 FILE filetab.obj
 FILE fragment.obj
 FILE global.obj