Make can-observable-object the default route.data type

[chasenlehara]

• Update the docs to show can-observable-object as the default
• Change src/routedata.js to use can-observable-object instead of can-define/map/map
• Add tests specifically for can-observable-object
• Update the can-define/map/map tests to not rely on the old default data

We need to figure out IE compatibility. Right now can-observable-object is always imported because it’s the default type. I wonder if we should create a separate (define or legacy) module that IE users should import instead?

Part of https://github.com/canjs/canjs/issues/5207

[chasenlehara]

@phillipskevin The IE11 build is passing. This should be good to go now.