Generate a ol-debug.js script useful for debugging

Instead of running everything through the Compiler just to remove whitespace, we provide a build that is a simple concatenation of all scripts in dependency order.  This build (ol-debug.js) should never be used in production (the same applies to the old ol-whitespace.js build).  Instead, the intention is that it be used to aid in debugging during development.

buildcfg/ol-debug.json

@@ -0,0 +1,3 @@
+{
+  "exports": ["*"]
+}