Dead Water Polish translation update

Dead Water Polish translation update, updates delivered by Wesbane.
Heir To The Throne: Polish translation update

Heir To The Throne: Polish translation update, updates delivered by Wesbane.
Eastern Invasion: Polish translation update

Eastern Invasion: Polish translation update, updates delivered by Wesbane.
Legend of Wesmere Polish translation update

Legend of Wesmere: Polish translation update, updates delivered by Rafał.
The Rise of Wesnoth: Polish translation update 

The Rise of Wesnoth: Polish translation update, updates delivered by Rafał.
Removed comments

Removed comments to trigger new build.
Implement define= for mp scenarios and eras

Implemented reloading of configs with define= attributes in both mp_create and mp_wait::join_game().
Added myself to about.cfg and updated changelog.

Conflicts:
	changelog
	src/gamestatus.cpp
	src/gamestatus.hpp
	src/multiplayer_wait.cpp
Add define functionality to modifications.

Added a new method, void create_engine::prepare_for_era_and_mods(),
which sets era and mod in game classification.
Prepare_for_[scenario, campaign] then set their respective defines and reload.

Conflicts:
	changelog
	src/gamestatus.cpp
	src/gamestatus.hpp
Fixed reloading for commandline mp
Implemented defines for largest mainline scenarios
Two Brothers: Polish translation update 

Two Brothers: Polish translation update, updates delivered by Wesbane.
Merge pull request #221 from aquileia/VC_update

Fix openMP build
move teambuilder to its own file
rename drawable_unit.?pp -> unit_drawer.?pp, b/c of new contents
rename gamestatus.?pp -> game_data.?pp, b/c of content changes
change saved_game name to saved_game_ in play_controllers
add game_state class, separate from play_controller
move game_state to its own file
remove unused member (dead code)
Updated bigmap credits