Local map (#27)

* Update the readme, write about characters and a little bit about combat

Part 2 of #13

* first mockup for grid movement

* back to defaul enviroment

* Get the right information when creating the battle scene from the localmap scene

* first mockup for grid movement

* back to defaul enviroment

* Get the right information when creating the battle scene from the localmap scene

* substitute Game scene with the one with local map

* add local map and transition from it to combat

* cleanup incongruences between versions

* Add localmap to the scene

* bugfix for wrong indentation in Battler.gd . Avoid continously transition to combat if the player keeps the direction button towards the enemy (in the map)

* Deleted template comments; Class, script and filename renamed in CamelCase;
Signal in LocalMap connected in parent node.