[KBD] Add German Extended 1 keyboard layout

Author: EricKohl

boot/bootdata/hivesys.inf

@@ -541,6 +541,10 @@ HKLM,"SYSTEM\CurrentControlSet\Control\Keyboard Layouts\00010407","Layout File",
 HKLM,"SYSTEM\CurrentControlSet\Control\Keyboard Layouts\00010407","Layout Text",0x00000000,%GERMAN_IBM%
 HKLM,"SYSTEM\CurrentControlSet\Control\Keyboard Layouts\00010407","Layout Display Name",0x00000000,"@%SystemRoot%\system32\input.dll,-5012"
 
+HKLM,"SYSTEM\CurrentControlSet\Control\Keyboard Layouts\00020407","Layout File",0x00000000,"kbdgre1.dll"
+HKLM,"SYSTEM\CurrentControlSet\Control\Keyboard Layouts\00020407","Layout Text",0x00000000,%GERMAN_EXTENDED1%
+HKLM,"SYSTEM\CurrentControlSet\Control\Keyboard Layouts\00020407","Layout Display Name",0x00000000,"@%SystemRoot%\system32\input.dll,-5143"
+
 HKLM,"SYSTEM\CurrentControlSet\Control\Keyboard Layouts\00000807","Layout File",0x00000000,"kbdsg.dll"
 HKLM,"SYSTEM\CurrentControlSet\Control\Keyboard Layouts\00000807","Layout Text",0x00000000,%SWISS_GERMAN%
 HKLM,"SYSTEM\CurrentControlSet\Control\Keyboard Layouts\00000807","Layout Display Name",0x00000000,"@%SystemRoot%\system32\input.dll,-5024"

boot/bootdata/txtsetup.sif

@@ -515,6 +515,8 @@ Default = "XT-, AT- or extended keyboard (83-105 keys)"
 00000437 = "Georgian"
 00000407 = "German (Germany)"
 00010407 = "German (IBM)"
+00020407 = "German Extended (E1)"
+;00030407 = "German Extended (E2)"
 00060407 = "German (de_ergo)"
 00050407 = "German (NEO-1.1)"
 00040407 = "German (Ristome)"
@@ -579,6 +581,8 @@ Default = "XT-, AT- or extended keyboard (83-105 keys)"
 00000407 = kbdgr.dll
 00000807 = kbdsg.dll
 00010407 = kbdgr1.dll
+00020407 = kbdgre1.dll
+;00030407 = kbdgre2.dll
 00050407 = kbdgneo.dll
 00060407 = kbdgerg.dll
 00040407 = kbdgrist.dll

dll/keyboard/CMakeLists.txt

@@ -31,6 +31,7 @@ list(APPEND _keyboard_layouts
     kbdgneo
     kbdgr
     kbdgr1
+    kbdgre1
     kbdgrist
     kbdhe
     kbdheb