Preparing to have gsChat gamestate

- Start chat implementation: chat strings are on the screen - Fix teleportation on water regression

Fix bug with holding switch tool

Use firepunch sprite

Stub for chat implementation

- Fix bug with picking up ammos from cases, when total ammo count may become more than AMMO_INFINITE - Initial implementation of weapon activation only after some turns

Better rope

Update City theme

Add City theme by Tiyuri

Add theme and map Plane by Tiyuri

Fix 'AI may break demos playing' message while loading saves

Add Island theme by Tiyuri

Add map 'Hedgewars' by Tiyuri

Mention Luca Bonora on About page

Add italian translation by daimadoshi85

Fix some bugs with dropping from parachute

Initial support for attacking from rope

- Continue preparation for implementing attack from rope and parachute - Parachute turns off when space button is pressed

Some preparation work for attacking from rope, parachute and etc.

Remove AltSlot and AltAmmo fields of Hedgehog record, as they are not actually needed

Timer as hedgehog message (avoid possible desync in very rare cases)

Implement whip weapon

Initial implementation of mortar

Use default ammostore string size for weapons number instead of predefined const