Warnings fixes
* Suppress `missing-braces` for Clang
* Fixed many C4275 warnings
* Fixed almost all Clang/GCC warnings
* Silence most frequent MSVC warning.
* Fixed some pessimizing-move warnings
* Fixed some unused capture warnings
* Node graph initialization optimized.
* Fixed "Unathorized obstacle access".
* Pathfinding tracing disabled with ifdef.
* Misc bonus calculation optimizations.
* Removed timestamp from log lines. Date formatting eats too much CPU.
* Paths for all heroes in Client are now cached
