[Feature] Client Checksum Verification (Resubmit old 1678) (#1922)

* [Feature] Client Checksum Verification (Resubmit old 1678)

* Updated db version

* Add new updatechecksum to CmakeLists.txt

* Removed magic number and used constant

* Fix new command to have access to worldserver

* spacing, more venbose desc and remove unneeded check

* Cleanup, refactoring

Co-authored-by: Akkadius <akkadius1@gmail.com>

common/patches/rof2_structs.h

@@ -5218,6 +5218,11 @@ struct SayLinkBodyFrame_Struct {
 /*056*/
 };
 
+struct Checksum_Struct {
+    uint64_t checksum;
+    uint8_t  data[2048];
+};
+
 	}; /*structs*/
 
 }; /*RoF2*/