Version 0.4 - Village, Leader and Building System

Leader and Village:

- Added a leader placeholder (TODO: Change model and add animations).

- Added tent placeholder that provides resources per second. (TODO: Change model and add other buildings)

Building system:

- Added building menu. Typo: Gold Towers suppose to be a gold building.

- Building 1 can only be build in village area.

- Building 2 and 3 can only be build in maze defense area.