Add a cmake option to disable building applications: MARBLE_BUILD_APPS
Add a cmake option to disable building applications: MARBLE_BUILD_APPS

tzapzoor/marble,David-Gil/marble-dev,tucnak/marble,quannt24/marble,tzapzoor/marble,tucnak/marble,David-Gil/marble-dev,probonopd/marble,David-Gil/marble-dev,probonopd/marble,tucnak/marble,tucnak/marble,probonopd/marble,probonopd/marble,David-Gil/marble-dev,tucnak/marble,quannt24/marble,tucnak/marble,quannt24/marble,probonopd/marble,tzapzoor/marble,probonopd/marble,tzapzoor/marble,tzapzoor/marble,quannt24/marble,tzapzoor/marble,quannt24/marble,quannt24/marble,David-Gil/marble-dev,quannt24/marble,tzapzoor/marble,David-Gil/marble-dev,probonopd/marble,tucnak/marble,tzapzoor/marble