Hygiene: Create array of style modules

Resources.php is becoming a bit of a dumping ground so I want to
make it more structured using variables.

Note: the position: top setting is not needed when using addModuleStyles
which all of these are using.

Merge toast styles with toast module

Change-Id: Ia76c30cd580c8028fb4f222f92a39af913371b2a
Merge "Hygiene: Create array of style modules"