Check range of integral when converting from number

[Flamefire]

In Lua numbers are essentially doubles. So the following is valid in lua: foo(-1)

If this is bound to a C++ function void foo(unsigned i) it silently does the wrong thing.

This is caused by the unchecked cast at:

kaguya/include/kaguya/type.hpp

Line 520 in 38ca7e1

return static_cast<get_type>(lua_type_traits<lua_Number>::get(l, index));

Similar problem for C++ function void bar(int8_t i) called with foo(1000)

Proposed fix:

lua_Number num = lua_type_traits<lua_Number>::get(l, index);
if(num < std::numeric_limits<get_type>::min() || num > std::numeric_limits<get_type>::max())
  throw LuaTypeMismatch();
return static_cast<get_type>(num);

Probably extract the check to a standalone function as it is also required at other places (e.g. opt and for Lua 5.3)

Not sure if this breaks the contract of strictCheckType as it may be possible, that a value passes the check (just from checking types) but fails to be gotten as it is outside the range.