Add CMake

(cherry picked from commit ee2afda)

.gitignore

@@ -1,14 +1,48 @@
-/bam
 /.bam
-/config.lua
+/bam
 /build
-/other/*/lib
+/config.lua
+/objs
 /other/*/include
+/other/*/lib
 __pycache__/
+*.dll
 *.pyc
 *.pyo
 scripts/work/
 /SDL.dll
 /freetype.dll
 /autoexec.cfg
 _test.exe
+Info.plist
+
+crapnet*
+fake_server*
+map_resave*
+map_version*
+mastersrv*
+packetgen*
+teeworlds*
+teeworlds_srv*
+versionsrv*
+
+# CMake
+data
+generated
+
+.ninja_deps
+.ninja_log
+CMakeCache.txt
+CMakeFiles
+CMakeSettings*
+CPackConfig.cmake
+CPackSourceConfig.cmake
+Debug
+Makefile
+Release
+_CPack_Packages/
+build.ninja
+cmake_install.cmake
+install_manifest.txt
+pack_*/
+rules.ninja