neovars: register tab as *-hotkey so it works properly in einhandneo and BST

- Tab is now processed through neovars even if shift is pressed simulatenously.
- Einhandneo now reacts to shift+M3+tab also on the left tab (toggle caps-lock)
- Einhandneo sets up a caps-lock symbol for the on-screen keyboard
- (fix) On-screen board now displays the tab correctly on level 5

windows/neo-vars/src/einhandneo.ahk

@@ -5,7 +5,8 @@ If (einHandNeo)
   CharProc___EH1()
 
 CP3F10 := "P___EHt"
-CP5TAB := "P__M2LT"
+GUISYM("P__EHSd","EH")
+GUISYM("P__M2LT","⇪")  ; alternativ "⇫"
 
 CharProc___EHt() {
   global
@@ -61,8 +62,9 @@ CharProc___EH1() {
   TKEH_VKBDSC035 := "VK59SC02C" ; j -> ü
   ; Modify Space
   ED1("space","P__EHSd")
-  GUISYM("P__EHSd","EH")
   ED("EHSpace",0,"U000020","U000020","U000020","S__N__0","U0000A0","U00202F")
+  ; Modify Tab
+  ED("tab"  ,0,"U000009","U000009","S__Comp","U000009","P__M2LT","U000009")
 }
 
 CharProc___EH0() {
@@ -103,7 +105,7 @@ CharProc___EH0() {
   TKEH_VKBESC034 := "" ; .
   TKEH_VKBDSC035 := "" ; j
   ED("space",0,"U000020","U000020","U000020","S__N__0","U0000A0","U00202F")
-  GUISYM("P__EHSd","")
+  ED("tab"  ,0,"U000009","U000009","S__Comp","U000009","U000009","U000009")
 
   RemoveTransformEinhand()  ; make sure we remove trafo
 }

windows/neo-vars/src/keydefinitions.ahk

@@ -386,10 +386,9 @@ Layout00000407() {
   RSCN("053","6E","2E") ; NumpadDot/NumpadDel
 ; Diverses
   RKEYS("F1,F2,F3,F4,F5,F6,F7,F8,F9,F10,F11,F12")
-  RKEYS("space,enter,backspace")
+  RKEYS("tab,space,enter,backspace")
   RKEYS("del,ins,home,end,pgup,pgdn,up,down,left,right")
 ; Diverses ohne *
-  RKEYN("tab", "tab")
   RKEYN("esc", "esc")
   RKEYN("numpadenter", "numpadenter")
 ; Modifier
@@ -599,10 +598,9 @@ Layout00000807() {
   RSCN("053","6E","2E") ; NumpadDot/NumpadDel
 ; Diverses
   RKEYS("F1,F2,F3,F4,F5,F6,F7,F8,F9,F10,F11,F12")
-  RKEYS("space,enter,backspace")
+  RKEYS("tab,space,enter,backspace")
   RKEYS("del,ins,home,end,pgup,pgdn,up,down,left,right")
 ; Diverses ohne *
-  RKEYN("tab", "tab")
   RKEYN("esc", "esc")
   RKEYN("numpadenter", "numpadenter")
 ; Modifier