* add overload to ActionManager to support capturing an AZStd::function
* move snapping settings to new settings registry
* remove unneeded reference in ViewportSettings
* move viewport setting function implementations to .cpp file
* add more sensible default values for snapping
* fix variable name for angle snapping
* remove const from function prototype value parameters
* add import/export api for free functions
* change from std::bind to a lambda
* remove redundant const for constexpr string_view
* add AZStd alias for std::abs
* restore grid and angle snapping
* add overload to ActionManager to support capturing an AZStd::function
* remove old legacy CGrid code
* fix build after merge
* review feedback changes - remove 1.0f multiplies
Tom Hulton-Harrop
b185a94519