add wrenchable flag to small storage battery.
Wrenchable means can be added and removed by a wrench
Added processing of wrenchable flag. There appears to be a vanilla bug
where a jumper cable and a wheel installed on the same part causes the
wheel to be removeable without proper equipment. Affects wrenchable type
too.
Fixes vehicle remove checking if part is a wheel or a cable, or anything
else that doesn't need the standard suite of tools
added comments, removed redundant variable
Separates out core checking of valid part select from do_install
fixed drive system conflicts
refactor
Can now add and remove items with WRENCHABLE flag, if have a wrench.
Modified install process so that a list of possible items to install is
displayed, even if you have no tools. It still lists when a tool is
missing,so that should be fine
Corrected install message for wrenchable items, to only require a wrench
as a tool
Fixed ui relating to install of wrenchable parts
Fixed plural message for parts remove
Fixed message for is_loose remove
Renamed wrenchable to tool_wrench, add tool_none for hand removal.
added flags to all batteries
fixed mechanics skill check
removed some redundant code
fixes unremovable regular parts
fixes wheel removal without jack
made UNMOUNT_ON_MOVE be treated the same as TOOL_NONE when installing or
removing a part. Other properties of UNMOUNT_ON_MOVE unchanged
reduced difficulty of install of storage battery
added vehicle part storage_battery_mount, configured storage battery to
have location on_battery_mount
Adds storage battery mount, and changes code for storage battery to
require it