refactor(math,time): replace math & time modules with Starlark upstream versions

After a *large* community effort, we've successfully moved two packages from
starlib into the "real" standard library in go-starlark:
* math: google/starlark-go#357
* time: google/starlark-go#327

In addition, both time & math imports have lost thier ".star" suffixes:

load("time.star", "time") -> load("time", "time")
load("math.star, "math") -> load("math", "math")

Both of these packages have had a great deal of vetting & improvement in the
process of migrating. While this does introduce many breaking changes for both
packages, both packages have better stability & performance characteristics.

Moving forward, we'll try to follow the pattern of developing & testing packages
here, and for those deemed worthy, move them up into go-starlark. Once a package
lands there, we'll switch starlib to being a strict import-and-document-only,
which effectively locks their API. Keeping package APIs locked will cut down on
drift, benefitting the broader starlark ecosystem.

BREAKING CHANGE:
math & time modules have been overhauled. Refer to package documentation for
details

Author: b5

README.md

@@ -58,9 +58,9 @@ The following is a list of the packages currently in the standard library
 | [`hash`](https://github.com/qri-io/starlib/tree/master/hash)                       | <img width=190/>[![Go Docs](https://godoc.org/github.com/qri-io/starlib/hash?status.svg)](https://godoc.org/github.com/qri-io/starlib/hash)                       | hash operations (md5/sha1/sha256)               |
 | [`html`](https://github.com/qri-io/starlib/tree/master/html)                       | <img width=190/>[![Go Docs](https://godoc.org/github.com/qri-io/starlib/html?status.svg)](https://godoc.org/github.com/qri-io/starlib/html)                       | html text processing                            |
 | [`http`](https://github.com/qri-io/starlib/tree/master/http)                       | <img width=190/>[![Go Docs](https://godoc.org/github.com/qri-io/starlib/http?status.svg)](https://godoc.org/github.com/qri-io/starlib/http)                       | http client operations                          |
-| [`math`](https://github.com/qri-io/starlib/tree/master/math)                       | <img width=190/>[![Go Docs](https://godoc.org/github.com/qri-io/starlib/math?status.svg)](https://godoc.org/github.com/qri-io/starlib/math)                       | mathematical functions & values                 |
+| [`math`](https://pkg.go.dev/go.starlark.net/lib/math)                       | <img width=190/>[![Go Docs](https://godoc.org/github.com/go.starlark.net/lib/math?status.svg)](https://pkg.go.dev/go.starlark.net/lib/math)                       | mathematical functions & values [upstreamed into go-starlark](https://github.com/google/starlark-go/pull/357)                |
 | [`re`](https://github.com/qri-io/starlib/tree/master/re)                           | <img width=190/>[![Go Docs](https://godoc.org/github.com/qri-io/starlib/re?status.svg)](https://godoc.org/github.com/qri-io/starlib/re)                           | regular expressions                             |
-| [`time`](https://github.com/qri-io/starlib/tree/master/time)                       | <img width=190/>[![Go Docs](https://godoc.org/github.com/qri-io/starlib/time?status.svg)](https://godoc.org/github.com/qri-io/starlib/time)                       | time operations                                 |
+| [`time`](https://github.com/google/starlark-go/blob/master/lib/time/time.go)                       | <img width=190/>[![Go Docs](https://godoc.org/go.starlark.net/lib/time?status.svg)](https://pkg.go.dev/go.starlark.net/lib/time)                       | time operations, [upstreamed into go-starlark](https://github.com/google/starlark-go/pull/327)                                 |
 | [`xlsx`](https://github.com/qri-io/starlib/tree/master/xlsx)                       | <img width=190/>[![Go Docs](https://godoc.org/github.com/qri-io/starlib/xlsx?status.svg)](https://godoc.org/github.com/qri-io/starlib/xlsx)                       | xlsx file format reading                        |
 | [`zipfile`](https://github.com/qri-io/starlib/tree/master/zipfile)                 | <img width=190/>[![Go Docs](https://godoc.org/github.com/qri-io/starlib/zipfile?status.svg)](https://godoc.org/github.com/qri-io/starlib/zipfile)                 | support for zip archives                        |
 

go.mod

@@ -16,13 +16,12 @@ replace (
 require (
 	github.com/360EntSecGroup-Skylar/excelize v1.4.1
 	github.com/PuerkitoBio/goquery v1.5.1
-	github.com/cactus/gostrftime v0.0.0-20190922123236-884915fd58c8
 	github.com/dustmop/soup v1.1.2-0.20190516214245-38228baa104e
 	github.com/niemeyer/pretty v0.0.0-20200227124842-a10e7caefd8e // indirect
 	github.com/paulmach/orb v0.1.5
 	github.com/pkg/errors v0.8.1
 	github.com/stretchr/testify v1.5.1
-	go.starlark.net v0.0.0-20200330013621-be5394c419b6
+	go.starlark.net v0.0.0-20210406145628-7a1108eaa012
 	golang.org/x/net v0.0.0-20200324143707-d3edc9973b7e
 	gopkg.in/check.v1 v1.0.0-20200227125254-8fa46927fb4f // indirect
 	gopkg.in/yaml.v2 v2.2.8

go.sum

@@ -1,20 +1,40 @@
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@@ -30,29 +50,67 @@ github.com/pkg/errors v0.8.1 h1:iURUrRGxPUNPdy5/HRSm+Yj6okJ6UtLINN0Q9M4+h3I=
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