inconsistency with deployment keyword .sources and .files

Deployment uses .sources where as source/header file inclusion uses .files.
Keyword should be unified to .files in both cases.

case example:

deployment (wrong):
images.sources = images
images.path = .
DEPLOYMENT += images

source inclusion (correct):
sources.files = $$SOURCES $$HEADERS $$RESOURCES runme.pro files
sources.path = $$QT_BUILD_TREE/runme

This is can be found from WinCE cases as well.