also unified delimiters to ',' - no effect on functionality

FEATURE CHANGES:
* There's a new checkbox in the NBUtil: "Override all node masses?" - if unchecked, the TotalMass slider doesn't affec the export. If checked, all nodes will get the 'l' flag and weight override parameter. This is the only way to propagate the slider setting to the truck file.
    !KNOWN BUG! The total mass inflates every time the checkbox is used - probably because the dry_mass/load_mass globals are unchanged and wheel nodes still abide it.
* The cinecam was added to the export.

CODE CHANGES:
* Actor.h: some fields/funcs renamed and moved around.
* Actor.cpp - the export function moved to new file 'ActorExport.cpp'

New checkbox: "Reduce dry mass by node mass overrides" - with explanatory text!

I fixed the !KNOWN BUG! mentioned in previous commit - exporting the TotalMass slider value back to truck file is somewhat of a challenge, but when you check both the checkboxes, it works (with a minor discrepancy).

The new code is in ActorExport.cpp.

A lot of code changes was needed:
* RigDef_File.h: removed enum WheelBraking which duplicated enum wheel_t::BrakeCombo in SimData.h. Using the new WheelBraking everywhere. Finally got rid of `wheel_t::BrakeCombo ActorSpawner::TranslateBrakingDef(RigDef::WheelBraking def);`
* Application.h: several enums moved here to break circular header dependencies (nasty C++ thing): RigDef::Keyword (from RigDef_File.h), WheelBraking + WheelPropulsion (from RigDef_File.h), FlareType+ ExtCameraMode (from GfxData.h)

It doesn't crash anymore but the wheel spring/damp still isn't saved.

For wheels, the UI was extended: aside of the scale slider there are now base spring/damp inputs and final value calculation.

The code assumes all wheels have same spring/damp and uses wheel [0] as the master record. This means all other wheels will be overriden by these params.

For wheels2/meshwheels2/flexbodywheels, the game shows a secondary spring/damp setting rows for the rim (actually tire tread, but historically reffered to as 'rim' in the docs) values. Those are then encoded to the truck file depending on keyword: wheel2 has them directly in the def, meshwheels2/flexbodywheels use 'set_beam_defaults'