Some survival mode changes by burp

Frontend: * Updated the flag selection to sort flags and divide them into groups (countries/community flags)

add a little explanation when modifying weaponset in ifrontend

set flake to non critical, no touches until game is starding, moved some variables to be initialized in the right place

Engine: * Updated clouds and flakes to fill the whole visible map (and borders) * Added simple clipping to most drawing functions (might need some testing) which should improve performance on low end graphic cards

Engine: * Made egg explosions less green

Campaign: * Fixed one of the tutorial's timers