Make typings compatible with @types/node.

Fixes name clashes and uses Node-compatible typings where possible.

Changes:
 - setTimout et al now return NodeJS.Timer instead of number
 - No "console" module anymore. Everyone uses it through global.console
 anyway.
 - We have a typed "global" instance with exposed properties now. Any
 "freeform" accesses must go through a `(<any>global).blah` cast.
 - remove tns-core-modules.{base,es6,es2015}.d.ts. Those were needed
 as workarounds for the ES6/DOM/Node type clashes.

tns-core-modules/timer/timer.android.ts

@@ -38,9 +38,10 @@ export function setTimeout(callback: Function, milliseconds = 0): number {
 }
 
 export function clearTimeout(id: number): void {
-    if (timeoutCallbacks[id]) {
-        timeoutHandler.removeCallbacks(timeoutCallbacks[id]);
-        delete timeoutCallbacks[id];
+    let index = id;
+    if (timeoutCallbacks[index]) {
+        timeoutHandler.removeCallbacks(timeoutCallbacks[index]);
+        delete timeoutCallbacks[index];
     }
 }