appname isn't respected when scaffolding a cmake project

[Didier Roche-Tolomelli]

Now that project name == app name instead of "app", the cmake project doesn't seem to support the name that we set.

appname is always "app" and so subdirectory on disk is "app" as well as any info in CmakeLists.txt. (For instance:
install(DIRECTORY "app/graphics" DESTINATION ${DATA_DIR})
)

ProblemType: Bug
DistroRelease: Ubuntu 15.10
Package: qtcreator-plugin-ubuntu 3.5.0+15.10.20150817-0ubuntu1
ProcVersionSignature: Ubuntu 4.1.0-3.3-generic 4.1.3
Uname: Linux 4.1.0-3-generic x86_64
ApportVersion: 2.18-0ubuntu7
Architecture: amd64
CurrentDesktop: Unity
Date: Mon Aug 24 13:14:23 2015
InstallationDate: Installed on 2012-05-28 (1182 days ago)
InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Release amd64 (20120425)
SourcePackage: qtcreator-plugin-ubuntu
UpgradeStatus: Upgraded to wily on 2014-10-31 (297 days ago)