move station equipment stock out to Lua
optional footer for tabgroups
first go at a stationview footer, still needs connecting to everything
initial translations from strings available in core
remove C++ station UI
remove unused core strings
move player money out to Lua
remove MarketAgent, Lua can do it all now
change station stock on buy/sell
check slot capacity
store player money in a property
add money formatter to NumberLabel
bind StationView footer cash label to player cash value
"mass in tonnes" format for NumberLabel
add total cargo and used/total cabin properties
footer with cash, cargo, cabins and legal status for all station screens
remove redundant cash and cargo/equip gauges
lua table set helper for bool values
expose equip purchasable flag to lua
only offer purchasable items for trade