Default hotkeys changes

Reassign 'Toggle mouse grab' to F3 to avoid conflicts with gameplay hotkeys

Unassign 'Show status bars' often toggled by mistake by new players and confused for a selection bug

Assign 'Bird eye view' to Shift+Tab

binaries/data/config/default.cfg

@@ -216,7 +216,7 @@ togglefullscreen = "Alt+Return"          ; Toggle fullscreen/windowed mode
 screenshot.watermark = "Alt+K"           ; Toggle product/company watermark for official screenshots
 wireframe = "Alt+Shift+W"                ; Toggle wireframe mode
 silhouettes = "Alt+Shift+S"              ; Toggle unit silhouettes
-mousegrabtoggle = "Ctrl+Alt"             ; Toggle mouse grabbing mode
+mousegrabtoggle = F3                     ; Toggle mouse grabbing mode
 
 ; > DIALOG HOTKEYS
 summary = "Ctrl+Tab"                     ; Toggle in-game summary
@@ -252,7 +252,7 @@ reset = "R"                                   ; Reset camera rotation to default
 follow = ""                                   ; Follow the first unit in the selection
 rallypointfocus = ""                          ; Focus the camera on the rally point of the selected building
 lastattackfocus = "Space"                     ; Focus the camera on the last notified attack
-togglebirdseyeview = ""                       ; Toggle bird's eye view
+togglebirdseyeview = "Shift+Tab"              ; Toggle bird's eye view
 zoom.in = Plus, NumPlus                       ; Zoom camera in (continuous control)
 zoom.out = Minus, NumMinus                    ; Zoom camera out (continuous control)
 zoom.wheel.in = WheelUp                       ; Zoom camera in (stepped control)
@@ -392,7 +392,7 @@ flareactivate = ""           ; Modifier to activate the mode to send a flare to
 calltoarms = ""              ; Modifier to call the selected units to the arms.
 focusfire = "F"              ; Modifier to control exclusively a building's arrows if it can attack
 ; Overlays
-showstatusbars = Tab         ; Toggle display of status bars
+showstatusbars = ""          ; Toggle display of status bars
 devcommands.toggle = "Alt+D" ; Toggle developer commands panel
 highlightguarding = PageDown ; Toggle highlight of guarding units
 highlightguarded = PageUp    ; Toggle highlight of guarded units