detect core load errors and use them to populate the new LoadErrorCon…

…troller interface in the ui, lets us know when something bad happens (although this isnt as important here as it is in android since we can just ctrl+shift+k, but oh well, good to test here first to make sure it all works)

lib/app/core-adapter/main.js

@@ -3,6 +3,13 @@
 
 if(!Node || !Node.core) return;
 var TurtlCore = Node.core.TurtlCore;
+var core_load_error = TurtlCore.get_load_error();
+if(core_load_error) {
+	setTimeout(function() {
+		new LoadErrorController({error: core_load_error});
+	}, 200);
+	return;
+}
 
 var res = TurtlCore.init();
 if(res !== 0) {

lib/node/core.js

@@ -2,14 +2,23 @@ const ref = require('ref');
 const ffi = require('ffi');
 const path = require('path');
 
-const dll_loc = path.join(__dirname, '..', '..', 'build', 'turtl_core');
-var TurtlCore = ffi.Library(dll_loc, {
-	'turtlc_start': ['int32', ['string', 'uint8']],
-	'turtlc_send': ['int32', ['pointer', 'size_t']],
-	'turtlc_recv': ['pointer', ['uint8', 'string', 'size_t*']],
-	'turtlc_recv_event': ['pointer', ['uint8', 'size_t*']],
-	'turtlc_free': ['int32', ['pointer', 'size_t']],
-});
+var load_error = null;
+try {
+	const dll_loc = path.join(__dirname, '..', '..', 'build', 'turtl_core');
+	var TurtlCore = ffi.Library(dll_loc, {
+		'turtlc_start': ['int32', ['string', 'uint8']],
+		'turtlc_send': ['int32', ['pointer', 'size_t']],
+		'turtlc_recv': ['pointer', ['uint8', 'string', 'size_t*']],
+		'turtlc_recv_event': ['pointer', ['uint8', 'size_t*']],
+		'turtlc_free': ['int32', ['pointer', 'size_t']],
+	});
+} catch(err) {
+	load_error = err;
+}
+
+exports.get_load_error = function() {
+	return load_error;
+};
 
 exports.init = function(userconfig) {
 	userconfig || (userconfig = {});