[SETUPLIB][USETUP] Move some code to the SetupLib.

- filesup.c's functions ConcatPaths(), Does[Path|File]Exist(), NtPathToDiskPartComponents(), OpenAndMapFile(), UnMapFile();
- Move the inicache library to setuplib as it'll be used for the 1st stage GUI setup too (indeed, there is no good INI file API
  under Win32; the Win32 profile "API" is just good enough to manipulate the win16 ini files, and are here anyways for backward
  compatibility purposes only);
- Move the OS detector too.
- Remove the duplicated ConcatPaths() code in arcname.c.

svn path=/branches/setup_improvements/; revision=74634
svn path=/branches/setup_improvements/; revision=74638

base/setup/lib/inicache.h

@@ -0,0 +1,122 @@
+/*
+ * PROJECT:     ReactOS Setup Library
+ * LICENSE:     GPL-2.0+ (https://spdx.org/licenses/GPL-2.0+)
+ * PURPOSE:     INI file parser that caches contents of INI file in memory.
+ * COPYRIGHT:   Copyright 2002-2018 Royce Mitchell III
+ */
+
+#pragma once
+
+typedef struct _INICACHEKEY
+{
+    PWCHAR Name;
+    PWCHAR Data;
+
+    struct _INICACHEKEY *Next;
+    struct _INICACHEKEY *Prev;
+} INICACHEKEY, *PINICACHEKEY;
+
+
+typedef struct _INICACHESECTION
+{
+    PWCHAR Name;
+
+    PINICACHEKEY FirstKey;
+    PINICACHEKEY LastKey;
+
+    struct _INICACHESECTION *Next;
+    struct _INICACHESECTION *Prev;
+} INICACHESECTION, *PINICACHESECTION;
+
+
+typedef struct _INICACHE
+{
+    PINICACHESECTION FirstSection;
+    PINICACHESECTION LastSection;
+} INICACHE, *PINICACHE;
+
+
+typedef struct _PINICACHEITERATOR
+{
+    PINICACHESECTION Section;
+    PINICACHEKEY Key;
+} INICACHEITERATOR, *PINICACHEITERATOR;
+
+
+typedef enum
+{
+    INSERT_FIRST,
+    INSERT_BEFORE,
+    INSERT_AFTER,
+    INSERT_LAST
+} INSERTION_TYPE;
+
+/* FUNCTIONS ****************************************************************/
+
+NTSTATUS
+IniCacheLoadFromMemory(
+    PINICACHE *Cache,
+    PCHAR FileBuffer,
+    ULONG FileLength,
+    BOOLEAN String);
+
+NTSTATUS
+IniCacheLoad(
+    PINICACHE *Cache,
+    PWCHAR FileName,
+    BOOLEAN String);
+
+VOID
+IniCacheDestroy(
+    PINICACHE Cache);
+
+PINICACHESECTION
+IniCacheGetSection(
+    PINICACHE Cache,
+    PWCHAR Name);
+
+NTSTATUS
+IniCacheGetKey(
+    PINICACHESECTION Section,
+    PWCHAR KeyName,
+    PWCHAR *KeyData);
+
+PINICACHEITERATOR
+IniCacheFindFirstValue(
+    PINICACHESECTION Section,
+    PWCHAR *KeyName,
+    PWCHAR *KeyData);
+
+BOOLEAN
+IniCacheFindNextValue(
+    PINICACHEITERATOR Iterator,
+    PWCHAR *KeyName,
+    PWCHAR *KeyData);
+
+VOID
+IniCacheFindClose(
+    PINICACHEITERATOR Iterator);
+
+
+PINICACHEKEY
+IniCacheInsertKey(
+    PINICACHESECTION Section,
+    PINICACHEKEY AnchorKey,
+    INSERTION_TYPE InsertionType,
+    PWCHAR Name,
+    PWCHAR Data);
+
+PINICACHE
+IniCacheCreate(VOID);
+
+NTSTATUS
+IniCacheSave(
+    PINICACHE Cache,
+    PWCHAR FileName);
+
+PINICACHESECTION
+IniCacheAppendSection(
+    PINICACHE Cache,
+    PWCHAR Name);
+
+/* EOF */