FGButton::init() passes the module parameter (a non-const string
reference) straight through to FGCommonInput::read_bindings() as a const
reference.
Change the FGButton::init() signature so that module is const there too,
so that callers can pass it const string references returned by
accessors without having to make copies.
Introduces delay-sec and release-delay-sec properties. The former is how
long to wait to run the binding(s) after pressing the button, the latter
is how long to wait after releasing the button. interval-sec now
specifies the delay before a repeat event occurs.
Clean-up how axes and button bindings are destroyed are re-built on reinit of the FGJoystickInput subsystem, so we get new, cleanly initialised items each time.
- initialize uninitialized properties
- use prefix instead of postfix increments
- reduce visibility of variables
- use empty() instead of size() == 0 for vector and string
- pass string by reference, not by value
