Refactor Common

This refactored common by:
* Moving out as many constants to class/function local scopes from being declared in `common`
* Spacing out common and any function to which a constant was moved out to
* Fixing comments here and there
In addition, some naming inconsistencies were fixed as well.

app/src/main/cpp/skyline/kernel/svc.h

@@ -34,7 +34,8 @@ namespace skyline {
         // 6.0.0+
         constexpr u8 TotalMemoryAvailableWithoutMmHeap = 0x15;
         constexpr u8 TotalMemoryUsedWithoutMmHeap = 0x16;
-    };
+    }
+
     namespace kernel::svc {
         /**
          * @brief Sets the process heap to a given Size. It can both extend and shrink the heap. (https://switchbrew.org/wiki/SVC#SetHeapSize)