* Build system: Support new in cmake 3.17 Ninja Multi-Config generator
(cherry picked from commit 369b618d4f)
* Build system: Fixed PCH with MSVC & Ninja generator
(cherry picked from commit d669f46b6d)
* Core: Fix clang 10 warnings
(cherry picked from commit 7272508cb4)
* Build system: Set -Wno-deprecated-copy only for clang 10
(cherry picked from commit 7fdeb259ba)
* Core/Misc: GCC build and warning fixes
(cherry picked from commit 4d69cc1c56)
* Build system: Print found git version when warning about it being too old
(cherry picked from commit 1ae72db201)
* Build system: Removed hard requirement on BOOST_ROOT being set as environment variable, it can now be also passed as command line argument to cmake and fix compile warning with boost 1.73
(cherry picked from commit 161944b764)
* Remove some code that was already removed from 335 and then cherry-picked into master
Co-authored-by: Shauren <shauren.trinity@gmail.com>
(cherry picked from commit 8c09b6e58b)
-Wwrite-strings is default enabled when -Wall is set in clang/gcc, hence removed.
-Woverloaded-virtual is now enabled for C++-code only, this removes the useless warnings when dabbling with C-only code.
