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
- vcmi can play music files from archives
- converted resource_reward fields in bank_config into json object, fixes 3000 gems reward in shipwreck
- some compile fixes for minizip
- minizip library is now part of sources, located at lib/minizip
- cmakefiles will compile minizip as dynamic library (Note: only 2 files used by vcmi are included in minizip.so)
- zip files can be loaded similar to other archives via filesystem.json
- mods can use Content.zip instead of Content/ directory. Files in directory will replace files in archive.
