Refactor component shortcuts (#995)
* custom-components
- create template components
- changes in PKG and requires comes from scripts/install_gradio.sh
* custom-components
- tweaks
* update-components
- tweaks
* update-components
- fix get_block_name
* update-components
- add webcam demo
* custom-components
- make use of get_block_name function whenever possible
* custom-components
- tweaks
* refactor-component-shortcuts
- no description whatsoever :D
* refactor-component-shortcuts
- tweaks
* refactor-component-shortcuts
- create shortcut function "component"
* refactor-component-shortcuts
- reformat
* refactor-component-shortcuts
- tweaks
* refactor-component-shortcuts
- tweaks
