SenseApis: New senseApiManager and X11XcbApi

Still fleshing these out but ultimately senseApiMgr will manage
sense apis, and the X11XcbApi is where we'll connect to Xcb and
read the screen.

configure.ac

@@ -43,6 +43,10 @@ AS_IF([test -z "${LEX}" || test -z "${YACC}"], [
     AC_MSG_ERROR([LEX and YACC must both be available in PATH.])
 ])
 
+AC_SEARCH_LIBS([dlopen], [dl ldl], [], [
+    AC_MSG_ERROR([dlopen() not found in libdl or libldl.])
+])
+
 AM_CPPFLAGS=m4_normalize(["-I\"\$(top_srcdir)/include\""])
 
 AC_SUBST([AM_CPPFLAGS])
@@ -53,6 +57,7 @@ AC_CONFIG_HEADERS([include/config.h])
 AC_CONFIG_FILES([
     Makefile hcore/Makefile
     hcore/deviceManager/Makefile
+    hcore/senseApis/Makefile
 ])
 
 AC_CONFIG_COMMANDS_POST([