[C++20] Enable C++20 + Fixes + FMT 9.1 (#2664)

* [CPP] Enable and build compliance with cpp20

* Windows build fix

* bump fmt version

* Updated fmt to 9.1, updated cmake minimum and verified preprocessor stuff works.

* Missing :

* Fix warning: top-level comma expression in array subscript is deprecated

* Fix warning: top-level comma expression in array subscript is deprecated

Co-authored-by: KimLS <KimLS@peqtgc.com>

zone/expedition.cpp

@@ -35,8 +35,6 @@ extern Zone* zone;
 
 // message string 8271 (not in emu clients)
 const char* const DZ_YOU_NOT_ASSIGNED        = "You could not use this command because you are not currently assigned to a dynamic zone.";
-// message string 9265 (not in emu clients)
-const char* const EXPEDITION_OTHER_BELONGS   = "{} attempted to create an expedition but {} already belongs to one.";
 // lockout warnings were added to live in March 11 2020 patch
 const char* const DZADD_INVITE_WARNING       = "Warning! You will be given replay timers for the following events if you enter %s:";
 const char* const DZADD_INVITE_WARNING_TIMER = "%s - %sD:%sH:%sM";
@@ -47,6 +45,12 @@ constexpr char LOCK_BEGIN[]                  = "The trial has begun. You cannot
 const int32_t Expedition::REPLAY_TIMER_ID = -1;
 const int32_t Expedition::EVENT_TIMER_ID  = 1;
 
+Expedition::Expedition(DynamicZone* dz) :
+	m_dynamic_zone(dz)
+{
+	assert(m_dynamic_zone != nullptr);
+}
+
 Expedition::Expedition(DynamicZone* dz, uint32_t id, uint32_t dz_id) :
 	m_dynamic_zone(dz),
 	m_id(id),