Build: Support common+sense+wilzor API libs; Move xcbXorg into commonLibs

xcbXorg is a connection manager lib that'll be used in common by all of
the xcb API frontends: xcbMouse, xcbWindow and xcbKeyboard. We moved
it into commonLibs to make it make more sense.

We also cleaned up the M4 scripting around AC_ARG_VAR-ing new common
libs as well as sense/wilzor libs.

configure.ac

@@ -64,16 +64,22 @@ AC_SUBST([AM_CPPFLAGS])
 AC_SUBST([YACC])
 AC_SUBST([LEX])
 
-m4_include([m4/sense_api_opts.m4])
+COMMONLIBS_ENABLED=
+SENSEAPIS_ENABLED=
+WILZORAPIS_ENABLED=
+m4_include([m4/commonlibs-opts.m4])
+m4_include([m4/sense-wilzor-api-opts.m4])
+AC_SUBST([COMMONLIBS_ENABLED])
 AC_SUBST([SENSEAPIS_ENABLED])
+AC_SUBST([WILZORAPIS_ENABLED])
 
 AC_CONFIG_HEADERS([include/config.h])
 AC_CONFIG_FILES([
     Makefile hcore/Makefile
     hcore/deviceManager/Makefile
     hcore/senseApis/Makefile
-    senseApis/Makefile
-    senseApis/xcbXorg/Makefile
+    commonLibs/Makefile
+    commonLibs/xcbXorg/Makefile
 ])
 
 AC_CONFIG_COMMANDS_POST([