headers.h: fix windows build

Hopefully :)
Ignore some files in git.

Ignore some files present after a clean build on GNU/Linux.
Merge pull request #7 from phelixnmc/patch-1

headers.h: fix windows build
Use QSplitter in game tab.

Move QSplitter in the game tab, so that the map is resizable
horizontally.
QSplitter also for chat / player list.

Also use a QSplitter with movable border between chat and player list.
Merge pull request #8 from domob1812/gitignore

Ignore some files in git.
Merge pull request #9 from domob1812/movable-separator

Movable separators