Fixes#1025
### Platforms Impacted
- [ ] iOS
- [ ] macOS
- [ ] win32 (Office)
- [ ] windows
- [ ] android
### Description of changes
Declare tslib dependency where tslib is used and we have importHelpers in tsconfig.ts in our framework package. Version of tslib is ^1.13.0 as that's the latest release that's supported due to our current typescript version (we need 3.9 or above to bump to 2.0 or later)
Also took the opportunity to use importHelpers in other packages that could use it, specifically for spreadArray so that is saves on bundle size. But if that change isn't desired, I can undo the last two commits and just fix the existing importHeaders
### Verification
Change builds, verifying that the bundle works properly on win32 and windows.
| Before | After |
|----------------------------------------------|--------------------------------------------|
| Screenshot or description before this change | Screenshot or description with this change |
### Pull request checklist
This PR has considered (when applicable):
- [ ] Automated Tests
- [ ] Documentation and examples
- [ ] Keyboard Accessibility
- [ ] Voiceover
- [ ] Internationalization and Right-to-left Layouts
* add theme registry documentation, update base readme
* Add start of a customize routine to components
* make customize function work with some demos
* start of documentation files plus updates to compose
* update documentation for composable
* Add some compose documentation
* add ToDo items in compose
* Copy over build logic from fabric
* get new build logic partially working
* making demo app webpack work (#2)
* add webpack configs and fix yarn start
* fix jest tests
* move to common webpack definition
* remove old rush based commands
* remove mustache codegen from repo
* populate with files copied from sdx-platform
* some build fixes
* Some little fixes to get started with initial scaffolding (#1)
* patch to make tsc happy
* fixing some typings
* breakup theming somewhat and fix breaks
* remove postbuild step for now
* add basic docz inclusion
* add start of a demo app
* fix webpack + typescript integration for demo app
* create web versions of native control set
* split component infrastructure into separate packages
* Split theme-registry out and add some documentation