Create 'build application' mode

[Cécile Camillieri]

The aim of the mode is to be able to make selection for a concern and create a woven aspect from this selection that can be used to generate code for example.

The mode is accessed in the main menu of TouchCORE (it's a third option in the menu) User can open a concern, make selection, see impacts like in normal select mode. When the selection is validated, the resulting model is displayed.

[Cécile Camillieri]

References #392: first implementation of 'build application' mode in TouchCORE

→ <<cset 1eece058c787>>

[Cécile Camillieri]

References #392: fix crash and transition direction when cancelling build application mode

→ <<cset ad6a2a5aa235>>

[Cécile Camillieri]

References #392: don't save woven application by default. Prompt user to save if needed when leaving.

→ <<cset 25d26d3d35f6>>