[signal,timer,init] Add customized versions of signal and timer from vrld/hump.

init.lua

@@ -17,6 +17,8 @@ return {
     meta = require(BASE..'meta'),
     rect = require(BASE..'rect'),
     shadowtext = require(BASE..'shadowtext'),
+    signal = require(BASE..'signal'),
     strings = require(BASE..'strings'),
+    timer = require(BASE..'timer'),
     vec = require(BASE..'vec')
 }