Deprecates Page and Template and adds deprecation messages to all the section classes.
Deprecates Trash class.
Fixes field preview to work within cms:render when used with cms:layout.
Merge branch 'release/2.1' into release/2.2

Conflicts:
	db/src/main/java/com/psddev/cms/db/RenderTag.java
Merge branch 'release/2.2'

Conflicts:
	db/src/main/java/com/psddev/cms/db/RenderTag.java
Improves field preview display.
Fixes area selection not always working in top navigation and ads matching page titles.