Improved localization. fix pathfinding infinity loop.
fix #276. add circus charioters.
Merge branch 'master' of https://bitbucket.org/dalerank/caesaria into macos-build
fix #207. Savepoint now work.
Merge branch 'master' of https://bitbucket.org/dalerank/caesaria
fix #352. Try fix 32/64 conflicts on max
Merge branch 'master' of https://bitbucket.org/dalerank/caesaria
fix #353. Generate REVSN even git cant get version
fix #222. Add messages about lower/raise worker wage by Rome. add event
flood clay pit.
add message on map turn. disabled building too close to enemy.
Improved trade advisor window.
fix #196. Add 2/5 years reign extend.
fix crash on debug mission failed.
Reorganize dependencies
It would be simpler later to use system-installed versions of dependencies, e.g. libpng, sdl_ttf, zlib, bzip on linux/osx.

Cannot check curl, updater compilation on linux (curl already in system includes)
Use system-provided libraries on linux/osx
Should compile on all platforms
Fix linking
Add option to disable system-installed dependencies usage
Add sdl2_ttf searcher
Revert one line in CMakeLists.txt
Fix linking