[input] use GetActiveWindowId() for resolving window actions for keyboard input instead of duplicating it's logic
[input] use same keymap fallback logic for touch inputs than for keyboard and joystick
[PVR][input] add special case handling and default keymaps for PVR radio in visualisation/fullscreen mode
Merge pull request #5327 from da-anda/keymap-handling

[PVR][input] allow custom keymaps also for PVR radio