HLE: Refactoring of ApplicationLoader (#4480)

* HLE: Refactoring of ApplicationLoader

* Fix SDL2 Headless

* Addresses gdkchan feedback

* Fixes LoadUnpackedNca RomFS loading

* remove useless casting

* Cleanup and fixe empty application name

* Remove ProcessInfo

* Fixes typo

* ActiveProcess to ActiveApplication

* Update check

* Clean using.

* Use the correct filepath when loading Homebrew.npdm

* Fix NRE in ProcessResult if MetaLoader is null

* Add more checks for valid processId & return success

* Add missing logging statement for npdm error

* Return result for LoadKip()

* Move error logging out of PFS load extension method

This avoids logging "Could not find Main NCA"
followed by "Loading main..." when trying to start hbl.

* Fix GUIs not checking load results

* Fix style and formatting issues

* Fix formatting and wording

* gtk: Refactor LoadApplication()

---------

Co-authored-by: TSR Berry <20988865+TSRBerry@users.noreply.github.com>

Ryujinx.HLE/Loaders/Processes/ProcessConst.cs

@@ -0,0 +1,33 @@
+namespace Ryujinx.HLE.Loaders.Processes
+{
+    static class ProcessConst
+    {
+        // Binaries from exefs are loaded into mem in this order. Do not change.
+        public static readonly string[] ExeFsPrefixes =
+        {
+            "rtld",
+            "main",
+            "subsdk0",
+            "subsdk1",
+            "subsdk2",
+            "subsdk3",
+            "subsdk4",
+            "subsdk5",
+            "subsdk6",
+            "subsdk7",
+            "subsdk8",
+            "subsdk9",
+            "sdk"
+        };
+
+        public static readonly string MainNpdmPath = "/main.npdm";
+
+        public const int NroAsetMagic = ('A' << 0) | ('S' << 8) | ('E' << 16) | ('T' << 24);
+
+        public const bool AslrEnabled = true;
+
+        public const int NsoArgsHeaderSize = 8;
+        public const int NsoArgsDataSize   = 0x9000;
+        public const int NsoArgsTotalSize  = NsoArgsHeaderSize + NsoArgsDataSize;
+    }
+}