options: Change ast_options from ast_flags to ast_flags64.

DeveloperNote: The 32-bit ast_options has no room left to accomodate new
options and so has been converted to an ast_flags64 structure. All internal
references to ast_options have been updated to use the 64-bit flag
manipulation macros.  External module references to the 32-bit ast_options
should continue to work on little-endian systems because the
least-significant bytes of a 64 bit integer will be in the same location as a
32-bit integer.  Because that's not the case on big-endian systems, we've
swapped the bytes in the flags manupulation macros on big-endian systems
so external modules should still work however you are encouraged to test.

main/loader.c

@@ -1546,7 +1546,7 @@ char *ast_module_helper(const char *line, const char *word, int pos, int state,
 	}
 
 	/* Tab completion can't be used during startup, or CLI and loader will deadlock. */
-	if (!ast_test_flag(&ast_options, AST_OPT_FLAG_FULLY_BOOTED)) {
+	if (!ast_fully_booted) {
 		return NULL;
 	}