* feat(form-field): add support for separate label and placeholder
* Adds the ability for the user to specify both a label and placeholder text for a form field.
* Renames all of the "floating placeholder" related terminology to refer to a "floating label" instead.
* Aligns the input placeholder color with the Material spec.
Fixes#6194.
* fix: add transition to placeholder text
Bumps the required RxJS version to 5.5.0 and gets rid of our RxChain in favor of using the lettable Rx operators. Refactors all the usages and updates the configs.
Fixes#7275.
Since the switch to the `mat-` prefix, the compatibility mode is no longer necessary. These changes remove anything that was left.
BREAKING CHANGE:
The `MATERIAL_COMPATIBILITY_MODE`, `CompatibilityModule`, `NoConflictStyleCompatibilityMode`, `MatPrefixRejector`, `MdPrefixRejector` symbols have been removed.
The GitHub code owners feature does not work properly right now because the different paths/globs to the folders (like the `input`) are not matching at all.
This is because the paths are not absolute nor relative paths but still include a directory name. This does not work properly and can be confirmed by playing with the `.gitignore` (which has the same pattern matching)
Paul Gschwendtner